First slide

Magnetic flux and induced emf

Question

A square coil ACDE with its plane vertical is released from rest in a horizontal uniform magnetic field E of length 2L (figure). The acceleration of the coil is

Easy

A

less than g for all the time till the loop crosses the magnetic field completely
B

less than g when it enters the field and greater than g when it comes out of the field
C

g all the time
D

less than g when it enters and comes out of the field but equal to g when it is within the field

Solution

When the coil is within the field, there is no change in the magnetic flux passing through it. Thus, no current will be induced and the acceleration will be g. But according to Lenz's law, the induced current will oppose its motion when it enters or leaves the field. Therefore, acceleration will be less than g.

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