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A square coil with its plane vertical is released from rest in a horizontal uniform magnetic field which extends over a length as shown in the figure. The acceleration of the coil is
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less than when it enters and comes out of the field but equal to when it is within the field
There will be three situations,
(i) When the coil is entering into the field, flux increases and from Lenz's law the induced emf or current opposes the change. Therefore .
(ii) When the coil is completely within the field, flux remains constant and hence no emf is induced. Therefore .
(iii) When the coil is coming out from the field, flux decreases and from Lenz's law the induced emf or current opposes the change. Therefore .
(i) When the coil is entering into the field, flux increases and from Lenz's law the induced emf or current opposes the change. Therefore .
(ii) When the coil is completely within the field, flux remains constant and hence no emf is induced. Therefore .
(iii) When the coil is coming out from the field, flux decreases and from Lenz's law the induced emf or current opposes the change. Therefore .
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