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  4. The variation of induced emf (e) with time (t) in a coil if a short bar magnet is moved along its axis with a constant velocity is best represented as

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Q. The variation of induced emf (e) with time (t) in a coil if a
short bar magnet is moved along its axis with a constant
velocity is best represented asPhysics Question Image

IIT JEEIIT JEE 2004

Solution:

Polarity of emf will be opposite in the two cases while
entering and while leaving the coil. Only in option
(b) polarity is changing. Hence, the correct option is (b).