Question

a bar magnet is made to fall through a long vertical copper tube .The speed (v) of the magnet as a function of time (t) is best represented by

• A. a
• B. b
• C. c
• D. d

Answer 1

The correct option is B b

As the magnetic fall is introduced a current in the copper pipe.

That current create a magnetic field that oppose the charging field

of falling magnet so the magnet is repelled and falls more slowly.

so, option $B$ is correct answer.