Question

a bar magnet is falling towards ground onits own .when it is near to a coil. is acceleration in downward direction equal to g ​

Answer 1

Answer:

a<g. Because according to Lenz's law, whatever may be the direction of induced current it will oppose the cause.

Explanation:

Here the cause is the free fall of magnet and so the induced current will oppose it and the acceleration of magnet will be less than the acceleration due to gravity g. This can also be explained in a different manner. When the magnet falls downwards with its north pole downwards.

The magnetic field lines passing through the coil in the downward direction increase. Since, the induced current opposes this the upper side of the coil will become north pole, so that field lines of coil's magnetic field are upwards. Now, like poles repel each other. Hence a<g.