A permanent bar magnet is moving inside a stationary coil of wire. If the magnet suddenly stops halfway inside the coil, Identify which of the following statement is true ?
A
The magnet will lose its magnetic field
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B
The current induced in the coil will continue flowing in the same direction
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C
The current induced in the coil will stop
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D
The current induced in the coil will reverse direction
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E
The magnet will be pushed out of the coil
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Solution
The correct option is E The current induced in the coil will stop Lenz law : Emf induced E=−dϕdt where ϕ=B.A
⟹ Induced current I=−1Rdϕdt
As soon as the permanent magnet stops moving inside a stationary coil, then the change in magnetic flux passing through the coil becomes zero and hence the current induced in the coil also stops.