A hollow metal pipe is held vertically and bar magnet is dropped through it with length along the axis of the pipe. The acceleration of the falling magnet is ( g = acceleration due to gravity)

Step-by-step solution

As a bar magnet falls through the pipe, an emf is induced in the body of the pipe due to change in magnetic flux. However, the free fall of the magnet will be opposed due to the development of eddy currents in accordance with Lenz's law. This process continues till the bar magnet attains a constant terminal velocity.