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A square coil \( A C D E \) with its plane vertical is released from rest in a horizontal uniform magnetic field \( \vec{B} \) of length \( 2 L \). The acceleration of the coil is
(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
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