Question

11. 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


(1) a
(2) b
(3) c
(4) d​

Answer 1

Answer:

b is the correct answer

If a bar magnet is falling vertically through the hollow region of long vertical copper tube then the magnetic flux linked with the copper tube (due to non-uniform magnetic field of magnet) changes and eddy currents are generated in the body of the tube by Lenzslaw the eddy currents oppose the falling of the magnet which therefore experiences a retarding force. The retarding force increases with increasing velocity of the magnet and finally equals the weight of the magnet. The magnet then attains a constant final terminal velocity i.e., magnet ultimately falls with zero acceleration in the tube.

Hence, b is correct.

Answer 2

Answer:

option b is the correct answer