A bar magnet is passing through a conducting loop of radius $R$ with velocity $v .$ The radius of the bar magnet is such that it just passes through the loop. The induced e.m.f. in the loop can be represented by the approximate curve:

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As Magnet is approaching toward the loop magnetic flux increases and Rate of increment of flux also increases so emf increases with time

at this moment emf is maximum and negative

Magnet is in middle of coil, at this moment emf is equal to zero

Now again flux start changing however polarity of emf get reverse

At this moment emf is again maximum

emf again become zero

Physics - EMI/AC Question with Solution | TestHub

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