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:

Step-by-step solution

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