question_answer

The variation of induced emf \[(\varepsilon )\] with time \[(t)\] in a coil if a short bar magnet is moved along its axis with a constant velocity is best represented as:

A)         

B)

C)       

D)

Correct Answer: B

Solution :

(b) The polarity of emf will be opposite in the two cases while the magnet enters the coil and while the magnet leaves the coil. Only in option (b) polarity is changing.