Question

 According to Lenz’s law of electromagnetic induction 

(1) The induced emf is not in the direction opposing the change in magnetic flux. 

(2) The relative motion between the coil and magnet produces change in magnetic flux. 

(3) Only the magnet should be moved toward coil. 

(4) Only the coil should be moved toward magnet.

Answer 1

The relative motion between the coil and magnet produces change in magnetic flux. The polarity of the induced emf is such that it opposes the change in magnetic flux responsible for its production. When the north pole of the bar magnet is being pushed toward the coil, the amount of magnetic flux linked with the coil increases. Current is induced in the coil in such a direction that it opposes the increase in flux. This is possible only when current is induced in the coil is in anticlockwise direction with respect to an observer on the side of the bar magnet. The magnetic moment associated with this induced current has north polarity toward the north pole of the approaching bar magnet. 

Hence, the correct option is (2).