Question

why does acceleration of a magnet falling through a long solenoid decrease

Answer 1

as it falls,it's flux increases because of solenoid turns.By Lenz law the direction of induced emf in a way that it generates a field in the solenoid repelling,the falling magnet. There by, opposing the increasing flux. The repulsion by the solenoid decreases the acceleration of the falling magnet.

Answer 2

The acceleration of a magnet falling through a solenoid decreases due to the repulsion phenomenon.

• This phenomenon is described using the Lenz law.

• The moment the magnet falls there is a sudden increase in the flux because the solenoid terms to be turned at that moment.

• According to Lenz law the direction of the induced emf is directed towards the way where it generates a field in the solenoid.

• Further the solenoid repells the falling magnet which results to the increasing flux.