Question

Imagine you have a length of copper pipe and two small solid cylindrical objects - one made of aluminum (or plastic, if you wish) and the other is a bar magnet. You may assume that the aluminum cylinder and the bar magnet have the same size (small enough to fit through the copper pipe without touching the sides) and mass. Now imagine dropping the aluminum through the copper pipe, and then dropping the bar magnet through the copper pipe. Do you observe any differences between the two, and if so, why?

Answer 1

- When we drope aluminium cylinder through copper pipe it freely fall under effect of gravitation through copper pipe.

- While we drope bar magnet through copper pipe it will not fall freely under gravitation.

Because when bar magnet move through copper pipe gravitation linked with copper pipe changes with motion of bar magnet and emf induce in copper pipe which opposes change of magnetic field ( i.e. resist motion of bar magnet in copper pipe)

Here resistive force acting on bar magnet is known as Lorentz Force