Question

Problem 14

Answer 1

Given information

Given:

A bar magnet falling inside a vertical metal tube and reaches a terminal velocity,

The tube is evacuated so that there is no air resistance.

To determine, the cause of this effect.

Step-by-step explanation

Step 1.

A magnetic flux is generated in front of the magnet as it falls through a metal tube. As the velocity of the magnet increases the flux increase and this flux change induces a current around the metal tube wall, and according to Lenz's law, in turn, creates an opposing magnetic field. This induced magnetic field pushes against the falling magnet and reduces its acceleration.