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

Question

A square coil ACDE with its plane vertical is released from rest in a horizontal uniform magnetic field B → of length 2 L . The acceleration of the coil is, less than g for all the time till the loop crosses the magnetic field completely., less than g when it enters the field and greater than g when it comes out of the field., g all the time., less than g when enters and comes out of the field but equal to g when it is within the field.

MARKS App · Accepted Answer

When the coil is within the field, there is no change in 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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