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1 | 4790-4793 | Can moving magnets produce electric currents Does the nature permit
such a relation between electricity and magnetism The answer is
resounding yes The experiments of Michael Faraday in England and
Joseph Henry in USA, conducted around 1830, demonstrated
conclusively that electric currents were induced in closed coils when
subjected to changing magnetic fields |
1 | 4791-4794 | Does the nature permit
such a relation between electricity and magnetism The answer is
resounding yes The experiments of Michael Faraday in England and
Joseph Henry in USA, conducted around 1830, demonstrated
conclusively that electric currents were induced in closed coils when
subjected to changing magnetic fields In this chapter, we will study the
phenomena associated with changing magnetic fields and understand
the underlying principles |
1 | 4792-4795 | The answer is
resounding yes The experiments of Michael Faraday in England and
Joseph Henry in USA, conducted around 1830, demonstrated
conclusively that electric currents were induced in closed coils when
subjected to changing magnetic fields In this chapter, we will study the
phenomena associated with changing magnetic fields and understand
the underlying principles The phenomenon in which electric current is
generated by varying magnetic fields is appropriately called
electromagnetic induction |
1 | 4793-4796 | The experiments of Michael Faraday in England and
Joseph Henry in USA, conducted around 1830, demonstrated
conclusively that electric currents were induced in closed coils when
subjected to changing magnetic fields In this chapter, we will study the
phenomena associated with changing magnetic fields and understand
the underlying principles The phenomenon in which electric current is
generated by varying magnetic fields is appropriately called
electromagnetic induction When Faraday first made public his discovery that relative motion
between a bar magnet and a wire loop produced a small current in the
latter, he was asked, “What is the use of it |
1 | 4794-4797 | In this chapter, we will study the
phenomena associated with changing magnetic fields and understand
the underlying principles The phenomenon in which electric current is
generated by varying magnetic fields is appropriately called
electromagnetic induction When Faraday first made public his discovery that relative motion
between a bar magnet and a wire loop produced a small current in the
latter, he was asked, “What is the use of it ” His reply was: “What is the
use of a new born baby |
1 | 4795-4798 | The phenomenon in which electric current is
generated by varying magnetic fields is appropriately called
electromagnetic induction When Faraday first made public his discovery that relative motion
between a bar magnet and a wire loop produced a small current in the
latter, he was asked, “What is the use of it ” His reply was: “What is the
use of a new born baby ” The phenomenon of electromagnetic induction
Chapter Six
ELECTROMAGNETIC
INDUCTION
Rationalised 2023-24
Electromagnetic
Induction
155
is not merely of theoretical or academic interest but also
of practical utility |
1 | 4796-4799 | When Faraday first made public his discovery that relative motion
between a bar magnet and a wire loop produced a small current in the
latter, he was asked, “What is the use of it ” His reply was: “What is the
use of a new born baby ” The phenomenon of electromagnetic induction
Chapter Six
ELECTROMAGNETIC
INDUCTION
Rationalised 2023-24
Electromagnetic
Induction
155
is not merely of theoretical or academic interest but also
of practical utility Imagine a world where there is no
electricity – no electric lights, no trains, no telephones and
no personal computers |
1 | 4797-4800 | ” His reply was: “What is the
use of a new born baby ” The phenomenon of electromagnetic induction
Chapter Six
ELECTROMAGNETIC
INDUCTION
Rationalised 2023-24
Electromagnetic
Induction
155
is not merely of theoretical or academic interest but also
of practical utility Imagine a world where there is no
electricity – no electric lights, no trains, no telephones and
no personal computers The pioneering experiments of
Faraday and Henry have led directly to the development
of modern day generators and transformers |
1 | 4798-4801 | ” The phenomenon of electromagnetic induction
Chapter Six
ELECTROMAGNETIC
INDUCTION
Rationalised 2023-24
Electromagnetic
Induction
155
is not merely of theoretical or academic interest but also
of practical utility Imagine a world where there is no
electricity – no electric lights, no trains, no telephones and
no personal computers The pioneering experiments of
Faraday and Henry have led directly to the development
of modern day generators and transformers Today’s
civilisation owes its progress to a great extent to the
discovery of electromagnetic induction |
1 | 4799-4802 | Imagine a world where there is no
electricity – no electric lights, no trains, no telephones and
no personal computers The pioneering experiments of
Faraday and Henry have led directly to the development
of modern day generators and transformers Today’s
civilisation owes its progress to a great extent to the
discovery of electromagnetic induction 6 |
1 | 4800-4803 | The pioneering experiments of
Faraday and Henry have led directly to the development
of modern day generators and transformers Today’s
civilisation owes its progress to a great extent to the
discovery of electromagnetic induction 6 2 THE EXPERIMENTS OF FARADAY AND
HENRY
The discovery and understanding of electromagnetic
induction are based on a long series of experiments carried
out by Faraday and Henry |
1 | 4801-4804 | Today’s
civilisation owes its progress to a great extent to the
discovery of electromagnetic induction 6 2 THE EXPERIMENTS OF FARADAY AND
HENRY
The discovery and understanding of electromagnetic
induction are based on a long series of experiments carried
out by Faraday and Henry We shall now describe some
of these experiments |
1 | 4802-4805 | 6 2 THE EXPERIMENTS OF FARADAY AND
HENRY
The discovery and understanding of electromagnetic
induction are based on a long series of experiments carried
out by Faraday and Henry We shall now describe some
of these experiments Experiment 6 |
1 | 4803-4806 | 2 THE EXPERIMENTS OF FARADAY AND
HENRY
The discovery and understanding of electromagnetic
induction are based on a long series of experiments carried
out by Faraday and Henry We shall now describe some
of these experiments Experiment 6 1
Figure 6 |
1 | 4804-4807 | We shall now describe some
of these experiments Experiment 6 1
Figure 6 1 shows a coil C1* connected to a galvanometer
G |
1 | 4805-4808 | Experiment 6 1
Figure 6 1 shows a coil C1* connected to a galvanometer
G When the North-pole of a bar magnet is pushed
towards the coil, the pointer in the galvanometer deflects,
indicating the presence of electric current in the coil |
1 | 4806-4809 | 1
Figure 6 1 shows a coil C1* connected to a galvanometer
G When the North-pole of a bar magnet is pushed
towards the coil, the pointer in the galvanometer deflects,
indicating the presence of electric current in the coil The
deflection lasts as long as the bar magnet is in motion |
1 | 4807-4810 | 1 shows a coil C1* connected to a galvanometer
G When the North-pole of a bar magnet is pushed
towards the coil, the pointer in the galvanometer deflects,
indicating the presence of electric current in the coil The
deflection lasts as long as the bar magnet is in motion The galvanometer does not show any deflection when the
magnet is held stationary |
1 | 4808-4811 | When the North-pole of a bar magnet is pushed
towards the coil, the pointer in the galvanometer deflects,
indicating the presence of electric current in the coil The
deflection lasts as long as the bar magnet is in motion The galvanometer does not show any deflection when the
magnet is held stationary When the magnet is pulled
away from the coil, the galvanometer shows deflection in
the opposite direction, which indicates reversal of the
current’s direction |
1 | 4809-4812 | The
deflection lasts as long as the bar magnet is in motion The galvanometer does not show any deflection when the
magnet is held stationary When the magnet is pulled
away from the coil, the galvanometer shows deflection in
the opposite direction, which indicates reversal of the
current’s direction Moreover, when the South-pole of
the bar magnet is moved towards or away from the
coil, the deflections in the galvanometer are opposite
to that observed with the North-pole for similar
movements |
1 | 4810-4813 | The galvanometer does not show any deflection when the
magnet is held stationary When the magnet is pulled
away from the coil, the galvanometer shows deflection in
the opposite direction, which indicates reversal of the
current’s direction Moreover, when the South-pole of
the bar magnet is moved towards or away from the
coil, the deflections in the galvanometer are opposite
to that observed with the North-pole for similar
movements Further, the deflection (and hence current)
is found to be larger when the magnet is pushed
towards or pulled away from the coil faster |
1 | 4811-4814 | When the magnet is pulled
away from the coil, the galvanometer shows deflection in
the opposite direction, which indicates reversal of the
current’s direction Moreover, when the South-pole of
the bar magnet is moved towards or away from the
coil, the deflections in the galvanometer are opposite
to that observed with the North-pole for similar
movements Further, the deflection (and hence current)
is found to be larger when the magnet is pushed
towards or pulled away from the coil faster Instead,
when the bar magnet is held fixed and the coil C1 is
moved towards or away from the magnet, the same
effects are observed |
1 | 4812-4815 | Moreover, when the South-pole of
the bar magnet is moved towards or away from the
coil, the deflections in the galvanometer are opposite
to that observed with the North-pole for similar
movements Further, the deflection (and hence current)
is found to be larger when the magnet is pushed
towards or pulled away from the coil faster Instead,
when the bar magnet is held fixed and the coil C1 is
moved towards or away from the magnet, the same
effects are observed It shows that it is the relative
motion between the magnet and the coil that is
responsible for generation (induction) of electric
current in the coil |
1 | 4813-4816 | Further, the deflection (and hence current)
is found to be larger when the magnet is pushed
towards or pulled away from the coil faster Instead,
when the bar magnet is held fixed and the coil C1 is
moved towards or away from the magnet, the same
effects are observed It shows that it is the relative
motion between the magnet and the coil that is
responsible for generation (induction) of electric
current in the coil Experiment 6 |
1 | 4814-4817 | Instead,
when the bar magnet is held fixed and the coil C1 is
moved towards or away from the magnet, the same
effects are observed It shows that it is the relative
motion between the magnet and the coil that is
responsible for generation (induction) of electric
current in the coil Experiment 6 2
In Fig |
1 | 4815-4818 | It shows that it is the relative
motion between the magnet and the coil that is
responsible for generation (induction) of electric
current in the coil Experiment 6 2
In Fig 6 |
1 | 4816-4819 | Experiment 6 2
In Fig 6 2 the bar magnet is replaced by a second coil
C2 connected to a battery |
1 | 4817-4820 | 2
In Fig 6 2 the bar magnet is replaced by a second coil
C2 connected to a battery The steady current in the
coil C2 produces a steady magnetic field |
1 | 4818-4821 | 6 2 the bar magnet is replaced by a second coil
C2 connected to a battery The steady current in the
coil C2 produces a steady magnetic field As coil C2 is
*
Wherever the term ‘coil’ or ‘loop’ is used, it is assumed that they are made up of
conducting material and are prepared using wires which are coated with insulating
material |
1 | 4819-4822 | 2 the bar magnet is replaced by a second coil
C2 connected to a battery The steady current in the
coil C2 produces a steady magnetic field As coil C2 is
*
Wherever the term ‘coil’ or ‘loop’ is used, it is assumed that they are made up of
conducting material and are prepared using wires which are coated with insulating
material FIGURE 6 |
1 | 4820-4823 | The steady current in the
coil C2 produces a steady magnetic field As coil C2 is
*
Wherever the term ‘coil’ or ‘loop’ is used, it is assumed that they are made up of
conducting material and are prepared using wires which are coated with insulating
material FIGURE 6 1 When the bar magnet is
pushed towards the coil, the pointer in
the galvanometer G deflects |
1 | 4821-4824 | As coil C2 is
*
Wherever the term ‘coil’ or ‘loop’ is used, it is assumed that they are made up of
conducting material and are prepared using wires which are coated with insulating
material FIGURE 6 1 When the bar magnet is
pushed towards the coil, the pointer in
the galvanometer G deflects Josheph Henry [1797 –
1878] American experimental
physicist,
professor
at
Princeton University and first
director of the Smithsonian
Institution |
1 | 4822-4825 | FIGURE 6 1 When the bar magnet is
pushed towards the coil, the pointer in
the galvanometer G deflects Josheph Henry [1797 –
1878] American experimental
physicist,
professor
at
Princeton University and first
director of the Smithsonian
Institution He made important
improvements in electro-
magnets by winding coils of
insulated wire around iron
pole pieces and invented an
electromagnetic motor and a
new, efficient telegraph |
1 | 4823-4826 | 1 When the bar magnet is
pushed towards the coil, the pointer in
the galvanometer G deflects Josheph Henry [1797 –
1878] American experimental
physicist,
professor
at
Princeton University and first
director of the Smithsonian
Institution He made important
improvements in electro-
magnets by winding coils of
insulated wire around iron
pole pieces and invented an
electromagnetic motor and a
new, efficient telegraph He
discoverd self-induction and
investigated how currents in
one circuit induce currents in
another |
1 | 4824-4827 | Josheph Henry [1797 –
1878] American experimental
physicist,
professor
at
Princeton University and first
director of the Smithsonian
Institution He made important
improvements in electro-
magnets by winding coils of
insulated wire around iron
pole pieces and invented an
electromagnetic motor and a
new, efficient telegraph He
discoverd self-induction and
investigated how currents in
one circuit induce currents in
another JOSEPH HENRY (1797 – 1878)
Rationalised 2023-24
Physics
156
moved towards the coil C1, the galvanometer shows a
deflection |
1 | 4825-4828 | He made important
improvements in electro-
magnets by winding coils of
insulated wire around iron
pole pieces and invented an
electromagnetic motor and a
new, efficient telegraph He
discoverd self-induction and
investigated how currents in
one circuit induce currents in
another JOSEPH HENRY (1797 – 1878)
Rationalised 2023-24
Physics
156
moved towards the coil C1, the galvanometer shows a
deflection This indicates that electric current is induced in
coil C1 |
1 | 4826-4829 | He
discoverd self-induction and
investigated how currents in
one circuit induce currents in
another JOSEPH HENRY (1797 – 1878)
Rationalised 2023-24
Physics
156
moved towards the coil C1, the galvanometer shows a
deflection This indicates that electric current is induced in
coil C1 When C2 is moved away, the galvanometer shows a
deflection again, but this time in the opposite direction |
1 | 4827-4830 | JOSEPH HENRY (1797 – 1878)
Rationalised 2023-24
Physics
156
moved towards the coil C1, the galvanometer shows a
deflection This indicates that electric current is induced in
coil C1 When C2 is moved away, the galvanometer shows a
deflection again, but this time in the opposite direction The
deflection lasts as long as coil C2 is in motion |
1 | 4828-4831 | This indicates that electric current is induced in
coil C1 When C2 is moved away, the galvanometer shows a
deflection again, but this time in the opposite direction The
deflection lasts as long as coil C2 is in motion When the coil
C2 is held fixed and C1 is moved, the same effects are observed |
1 | 4829-4832 | When C2 is moved away, the galvanometer shows a
deflection again, but this time in the opposite direction The
deflection lasts as long as coil C2 is in motion When the coil
C2 is held fixed and C1 is moved, the same effects are observed Again, it is the relative motion between the coils that induces
the electric current |
1 | 4830-4833 | The
deflection lasts as long as coil C2 is in motion When the coil
C2 is held fixed and C1 is moved, the same effects are observed Again, it is the relative motion between the coils that induces
the electric current Experiment 6 |
1 | 4831-4834 | When the coil
C2 is held fixed and C1 is moved, the same effects are observed Again, it is the relative motion between the coils that induces
the electric current Experiment 6 3
The above two experiments involved relative motion between
a magnet and a coil and between two coils, respectively |
1 | 4832-4835 | Again, it is the relative motion between the coils that induces
the electric current Experiment 6 3
The above two experiments involved relative motion between
a magnet and a coil and between two coils, respectively Through another experiment, Faraday showed that this
relative motion is not an absolute requirement |
1 | 4833-4836 | Experiment 6 3
The above two experiments involved relative motion between
a magnet and a coil and between two coils, respectively Through another experiment, Faraday showed that this
relative motion is not an absolute requirement Figure 6 |
1 | 4834-4837 | 3
The above two experiments involved relative motion between
a magnet and a coil and between two coils, respectively Through another experiment, Faraday showed that this
relative motion is not an absolute requirement Figure 6 3
shows two coils C1 and C2 held stationary |
1 | 4835-4838 | Through another experiment, Faraday showed that this
relative motion is not an absolute requirement Figure 6 3
shows two coils C1 and C2 held stationary Coil C1 is connected
to galvanometer G while the second coil C2 is connected to a
battery through a tapping key K |
1 | 4836-4839 | Figure 6 3
shows two coils C1 and C2 held stationary Coil C1 is connected
to galvanometer G while the second coil C2 is connected to a
battery through a tapping key K FIGURE 6 |
1 | 4837-4840 | 3
shows two coils C1 and C2 held stationary Coil C1 is connected
to galvanometer G while the second coil C2 is connected to a
battery through a tapping key K FIGURE 6 2 Current is
induced in coil C1 due to motion
of the current carrying coil C2 |
1 | 4838-4841 | Coil C1 is connected
to galvanometer G while the second coil C2 is connected to a
battery through a tapping key K FIGURE 6 2 Current is
induced in coil C1 due to motion
of the current carrying coil C2 FIGURE 6 |
1 | 4839-4842 | FIGURE 6 2 Current is
induced in coil C1 due to motion
of the current carrying coil C2 FIGURE 6 3 Experimental set-up for Experiment 6 |
1 | 4840-4843 | 2 Current is
induced in coil C1 due to motion
of the current carrying coil C2 FIGURE 6 3 Experimental set-up for Experiment 6 3 |
1 | 4841-4844 | FIGURE 6 3 Experimental set-up for Experiment 6 3 It is observed that the galvanometer shows a momentary deflection
when the tapping key K is pressed |
1 | 4842-4845 | 3 Experimental set-up for Experiment 6 3 It is observed that the galvanometer shows a momentary deflection
when the tapping key K is pressed The pointer in the galvanometer returns
to zero immediately |
1 | 4843-4846 | 3 It is observed that the galvanometer shows a momentary deflection
when the tapping key K is pressed The pointer in the galvanometer returns
to zero immediately If the key is held pressed continuously, there is no
deflection in the galvanometer |
1 | 4844-4847 | It is observed that the galvanometer shows a momentary deflection
when the tapping key K is pressed The pointer in the galvanometer returns
to zero immediately If the key is held pressed continuously, there is no
deflection in the galvanometer When the key is released, a momentory
deflection is observed again, but in the opposite direction |
1 | 4845-4848 | The pointer in the galvanometer returns
to zero immediately If the key is held pressed continuously, there is no
deflection in the galvanometer When the key is released, a momentory
deflection is observed again, but in the opposite direction It is also observed
that the deflection increases dramatically when an iron rod is inserted
into the coils along their axis |
1 | 4846-4849 | If the key is held pressed continuously, there is no
deflection in the galvanometer When the key is released, a momentory
deflection is observed again, but in the opposite direction It is also observed
that the deflection increases dramatically when an iron rod is inserted
into the coils along their axis 6 |
1 | 4847-4850 | When the key is released, a momentory
deflection is observed again, but in the opposite direction It is also observed
that the deflection increases dramatically when an iron rod is inserted
into the coils along their axis 6 3 MAGNETIC FLUX
Faraday’s great insight lay in discovering a simple mathematical relation
to explain the series of experiments he carried out on electromagnetic
induction |
1 | 4848-4851 | It is also observed
that the deflection increases dramatically when an iron rod is inserted
into the coils along their axis 6 3 MAGNETIC FLUX
Faraday’s great insight lay in discovering a simple mathematical relation
to explain the series of experiments he carried out on electromagnetic
induction However, before we state and appreciate his laws, we must get
familiar with the notion of magnetic flux, F B |
1 | 4849-4852 | 6 3 MAGNETIC FLUX
Faraday’s great insight lay in discovering a simple mathematical relation
to explain the series of experiments he carried out on electromagnetic
induction However, before we state and appreciate his laws, we must get
familiar with the notion of magnetic flux, F B Magnetic flux is defined in
the same way as electric flux is defined in Chapter 1 |
1 | 4850-4853 | 3 MAGNETIC FLUX
Faraday’s great insight lay in discovering a simple mathematical relation
to explain the series of experiments he carried out on electromagnetic
induction However, before we state and appreciate his laws, we must get
familiar with the notion of magnetic flux, F B Magnetic flux is defined in
the same way as electric flux is defined in Chapter 1 Magnetic flux through
Rationalised 2023-24
Electromagnetic
Induction
157
a plane of area A placed in a uniform magnetic field B (Fig |
1 | 4851-4854 | However, before we state and appreciate his laws, we must get
familiar with the notion of magnetic flux, F B Magnetic flux is defined in
the same way as electric flux is defined in Chapter 1 Magnetic flux through
Rationalised 2023-24
Electromagnetic
Induction
157
a plane of area A placed in a uniform magnetic field B (Fig 6 |
1 | 4852-4855 | Magnetic flux is defined in
the same way as electric flux is defined in Chapter 1 Magnetic flux through
Rationalised 2023-24
Electromagnetic
Induction
157
a plane of area A placed in a uniform magnetic field B (Fig 6 4) can
be written as
F B = B |
1 | 4853-4856 | Magnetic flux through
Rationalised 2023-24
Electromagnetic
Induction
157
a plane of area A placed in a uniform magnetic field B (Fig 6 4) can
be written as
F B = B A = BA cos q
(6 |
1 | 4854-4857 | 6 4) can
be written as
F B = B A = BA cos q
(6 1)
where q is angle between B and A |
1 | 4855-4858 | 4) can
be written as
F B = B A = BA cos q
(6 1)
where q is angle between B and A The notion of the area as a vector
has been discussed earlier in Chapter 1 |
1 | 4856-4859 | A = BA cos q
(6 1)
where q is angle between B and A The notion of the area as a vector
has been discussed earlier in Chapter 1 Equation (6 |
1 | 4857-4860 | 1)
where q is angle between B and A The notion of the area as a vector
has been discussed earlier in Chapter 1 Equation (6 1) can be
extended to curved surfaces and nonuniform fields |
1 | 4858-4861 | The notion of the area as a vector
has been discussed earlier in Chapter 1 Equation (6 1) can be
extended to curved surfaces and nonuniform fields If the magnetic field has different magnitudes and directions at
various parts of a surface as shown in Fig |
1 | 4859-4862 | Equation (6 1) can be
extended to curved surfaces and nonuniform fields If the magnetic field has different magnitudes and directions at
various parts of a surface as shown in Fig 6 |
1 | 4860-4863 | 1) can be
extended to curved surfaces and nonuniform fields If the magnetic field has different magnitudes and directions at
various parts of a surface as shown in Fig 6 5, then the magnetic
flux through the surface is given by
1
1
2
2
d
d
Φ =
+
+
B
A
B
A |
1 | 4861-4864 | If the magnetic field has different magnitudes and directions at
various parts of a surface as shown in Fig 6 5, then the magnetic
flux through the surface is given by
1
1
2
2
d
d
Φ =
+
+
B
A
B
A B |
1 | 4862-4865 | 6 5, then the magnetic
flux through the surface is given by
1
1
2
2
d
d
Φ =
+
+
B
A
B
A B =
B
i |
1 | 4863-4866 | 5, then the magnetic
flux through the surface is given by
1
1
2
2
d
d
Φ =
+
+
B
A
B
A B =
B
i A
i
d
all∑
(6 |
1 | 4864-4867 | B =
B
i A
i
d
all∑
(6 2)
where ‘all’ stands for summation over all the area elements dAi
comprising the surface and Bi is the magnetic field at the area element
dAi |
1 | 4865-4868 | =
B
i A
i
d
all∑
(6 2)
where ‘all’ stands for summation over all the area elements dAi
comprising the surface and Bi is the magnetic field at the area element
dAi The SI unit of magnetic flux is weber (Wb) or tesla meter
squared (T m2) |
1 | 4866-4869 | A
i
d
all∑
(6 2)
where ‘all’ stands for summation over all the area elements dAi
comprising the surface and Bi is the magnetic field at the area element
dAi The SI unit of magnetic flux is weber (Wb) or tesla meter
squared (T m2) Magnetic flux is a scalar quantity |
1 | 4867-4870 | 2)
where ‘all’ stands for summation over all the area elements dAi
comprising the surface and Bi is the magnetic field at the area element
dAi The SI unit of magnetic flux is weber (Wb) or tesla meter
squared (T m2) Magnetic flux is a scalar quantity 6 |
1 | 4868-4871 | The SI unit of magnetic flux is weber (Wb) or tesla meter
squared (T m2) Magnetic flux is a scalar quantity 6 4 FARADAY’S LAW OF INDUCTION
From the experimental observations, Faraday arrived at a
conclusion that an emf is induced in a coil when magnetic flux
through the coil changes with time |
1 | 4869-4872 | Magnetic flux is a scalar quantity 6 4 FARADAY’S LAW OF INDUCTION
From the experimental observations, Faraday arrived at a
conclusion that an emf is induced in a coil when magnetic flux
through the coil changes with time Experimental observations
discussed in Section 6 |
1 | 4870-4873 | 6 4 FARADAY’S LAW OF INDUCTION
From the experimental observations, Faraday arrived at a
conclusion that an emf is induced in a coil when magnetic flux
through the coil changes with time Experimental observations
discussed in Section 6 2 can be explained using this concept |
1 | 4871-4874 | 4 FARADAY’S LAW OF INDUCTION
From the experimental observations, Faraday arrived at a
conclusion that an emf is induced in a coil when magnetic flux
through the coil changes with time Experimental observations
discussed in Section 6 2 can be explained using this concept The motion of a magnet towards or away from coil C1 in
Experiment 6 |
1 | 4872-4875 | Experimental observations
discussed in Section 6 2 can be explained using this concept The motion of a magnet towards or away from coil C1 in
Experiment 6 1 and moving a current-carrying coil C2 towards
or away from coil C1 in Experiment 6 |
1 | 4873-4876 | 2 can be explained using this concept The motion of a magnet towards or away from coil C1 in
Experiment 6 1 and moving a current-carrying coil C2 towards
or away from coil C1 in Experiment 6 2, change the magnetic
flux associated with coil C1 |
1 | 4874-4877 | The motion of a magnet towards or away from coil C1 in
Experiment 6 1 and moving a current-carrying coil C2 towards
or away from coil C1 in Experiment 6 2, change the magnetic
flux associated with coil C1 The change in magnetic flux induces
emf in coil C1 |
1 | 4875-4878 | 1 and moving a current-carrying coil C2 towards
or away from coil C1 in Experiment 6 2, change the magnetic
flux associated with coil C1 The change in magnetic flux induces
emf in coil C1 It was this induced emf which caused electric
current to flow in coil C1 and through the galvanometer |
1 | 4876-4879 | 2, change the magnetic
flux associated with coil C1 The change in magnetic flux induces
emf in coil C1 It was this induced emf which caused electric
current to flow in coil C1 and through the galvanometer A
plausible explanation for the observations of Experiment 6 |
1 | 4877-4880 | The change in magnetic flux induces
emf in coil C1 It was this induced emf which caused electric
current to flow in coil C1 and through the galvanometer A
plausible explanation for the observations of Experiment 6 3 is
as follows: When the tapping key K is pressed, the current in
coil C2 (and the resulting magnetic field) rises from zero to a
maximum value in a short time |
1 | 4878-4881 | It was this induced emf which caused electric
current to flow in coil C1 and through the galvanometer A
plausible explanation for the observations of Experiment 6 3 is
as follows: When the tapping key K is pressed, the current in
coil C2 (and the resulting magnetic field) rises from zero to a
maximum value in a short time Consequently, the magnetic
flux through the neighbouring coil C1 also increases |
1 | 4879-4882 | A
plausible explanation for the observations of Experiment 6 3 is
as follows: When the tapping key K is pressed, the current in
coil C2 (and the resulting magnetic field) rises from zero to a
maximum value in a short time Consequently, the magnetic
flux through the neighbouring coil C1 also increases It is the change in
magnetic flux through coil C1 that produces an induced emf in coil C1 |
1 | 4880-4883 | 3 is
as follows: When the tapping key K is pressed, the current in
coil C2 (and the resulting magnetic field) rises from zero to a
maximum value in a short time Consequently, the magnetic
flux through the neighbouring coil C1 also increases It is the change in
magnetic flux through coil C1 that produces an induced emf in coil C1 When the key is held pressed, current in coil C2 is constant |
1 | 4881-4884 | Consequently, the magnetic
flux through the neighbouring coil C1 also increases It is the change in
magnetic flux through coil C1 that produces an induced emf in coil C1 When the key is held pressed, current in coil C2 is constant Therefore,
there is no change in the magnetic flux through coil C1 and the current in
coil C1 drops to zero |
1 | 4882-4885 | It is the change in
magnetic flux through coil C1 that produces an induced emf in coil C1 When the key is held pressed, current in coil C2 is constant Therefore,
there is no change in the magnetic flux through coil C1 and the current in
coil C1 drops to zero When the key is released, the current in C2 and the
resulting magnetic field decreases from the maximum value to zero in a
short time |
1 | 4883-4886 | When the key is held pressed, current in coil C2 is constant Therefore,
there is no change in the magnetic flux through coil C1 and the current in
coil C1 drops to zero When the key is released, the current in C2 and the
resulting magnetic field decreases from the maximum value to zero in a
short time This results in a decrease in magnetic flux through coil C1
and hence again induces an electric current in coil C1* |
1 | 4884-4887 | Therefore,
there is no change in the magnetic flux through coil C1 and the current in
coil C1 drops to zero When the key is released, the current in C2 and the
resulting magnetic field decreases from the maximum value to zero in a
short time This results in a decrease in magnetic flux through coil C1
and hence again induces an electric current in coil C1* The common
point in all these observations is that the time rate of change of magnetic
flux through a circuit induces emf in it |
1 | 4885-4888 | When the key is released, the current in C2 and the
resulting magnetic field decreases from the maximum value to zero in a
short time This results in a decrease in magnetic flux through coil C1
and hence again induces an electric current in coil C1* The common
point in all these observations is that the time rate of change of magnetic
flux through a circuit induces emf in it Faraday stated experimental
observations in the form of a law called Faraday’s law of electromagnetic
induction |
1 | 4886-4889 | This results in a decrease in magnetic flux through coil C1
and hence again induces an electric current in coil C1* The common
point in all these observations is that the time rate of change of magnetic
flux through a circuit induces emf in it Faraday stated experimental
observations in the form of a law called Faraday’s law of electromagnetic
induction The law is stated below |
1 | 4887-4890 | The common
point in all these observations is that the time rate of change of magnetic
flux through a circuit induces emf in it Faraday stated experimental
observations in the form of a law called Faraday’s law of electromagnetic
induction The law is stated below FIGURE 6 |
1 | 4888-4891 | Faraday stated experimental
observations in the form of a law called Faraday’s law of electromagnetic
induction The law is stated below FIGURE 6 4 A plane of
surface area A placed in a
uniform magnetic field B |
1 | 4889-4892 | The law is stated below FIGURE 6 4 A plane of
surface area A placed in a
uniform magnetic field B FIGURE 6 |
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