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Question

# A circular coil with its plane vertical is released from rest. It enters a region of a uniform magnetic field B at time t=t1 and leaves the region at time t=t2. The acceleration of the coil is

A
Less than g for all values of t.
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B
Equal to g for all values of t.
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C
Equal to g before t=t1 and after t=t2 but less than g between t1 and t2
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D
Less than g when it is entering the field and when it is leaving the field.
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Solution

## The correct option is D Less than g when it is entering the field and when it is leaving the field.When it is completely inside the field the flux remains constant but it changes at the time of entry and exit. This is opposed (Lenz’s law).

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