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1. 12.Electromagnetic
induction

2. Electric field Magnetic field

3. Michael faraday & Joseph Henry
independently discovered that ,
electric current is produced in a
coil when there is a relative motion
between the coil and magnet.

4. this current is
called induced
current

5. A phenomenon of production of Induced EMF or
current in the coil or conductor due to change
in the coil or magnetic flux linked with the coil
or conductor is called as Electromagnetic
induction

6. Space around a magnet where other magnet experiences
force is called magnetic field
Magnetic field
Magnetic field
represented by magnetic
lines of force

7. Space around a magnet where other magnet experiences
force is called magnetic field

10. Faraday’s 1st law of
electromagnetic
induction

13. As, magnet is moving towards or away from coil .
Is there any change in magnetic flux?
Yes
So e.m.f is induced.

15. Faradays 2nd law of
electromagnetic
induction

22. Lenz law

24. What is the reason
behind the induced
e.m.f?

25. Hence it will oppose
approaching n-pole

26. Hence it will oppose
approaching n-pole
In order to oppose
the approaching N-
pole, it should
behave as N-pole

27. 3. So, it is converted into electrical energy

28. Magnetic flux

36. Thus magnetic induction is
magnetic flux per unit
area and it is also called as
flux density
= tesla

37. Motional EMF-
Moving rod

46. Motional EMF
effective length

53. Motional EMF rod
– Non uniform B

58. Motional EMF –
Variable Velocity

64. EMF INDUCED IN
ROTATING COIL IN
FIELD

67. Putting in above
equation we get

69. Induced e.m.f (e) is not constant but varies with time or sin 𝝎𝒕,
Hence e.m.f is called sinusoidal e.m.f .
This is the basis of an A.C. generator.

71.  E.m.f induced is positive during 1st half cycle.
 E.m.f is induced is negative dduring 2nd half
cycle.

73. GENERATOR

74. GENERATOR
Working is same as that of motor.
Here, total amount of induced emf is given by e=Blv

88. Eddy currents

92. To minimize the eddy currents, instead of a solid metal block
cores are made of thin insulated metal strips or laminate.

93. Applications of
eddy currents

96. The strong eddy currents in the rotating drum oppose the motion

99. As there is no change in flux.

100. e.m.f is induced in the coil,
which will oppose the cause
producing it.

129. Mutual
Induction

134. Hence galvanometer in secondary
coil shows deflection

136. No deflection is produced in the galvanometer.

139. M= constant, called as
coefficient of mutual
induction or mutual
induction or mutual
inductance of the coil

142.  Coefficient of mutual induction or
mutual inductance of two coils is
defined as the ratio of e.m.f included
in one coil to the rate of change of
current in the other coil.

150. Primary winding Secondary winding

152. Hence magnetic flux through core also changes.
The amount of magnetic flux depends upon number of
turns of coil.