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  • A magnet is dropped down an infinitely long vertical copper tube:Option: 1 the magnet moves with continuously increasing velocity and ultimately acqu

A magnet is dropped down an infinitely long vertical copper tube:

Option: 1

the magnet moves with continuously increasing velocity and ultimately acquires a constant terminal velocity
 


Option: 2

the magnetic moves with continuously decreasing velocity and ultimately comes to rest
 


Option: 3

the magnet moves with continuously increasing velocity but constant acceleration
 


Option: 4

the magnet moves with continuously increasing velocity and acceleration


Answers (1)

best_answer

If 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 Lenz’s law. 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., magnetic ultimately falls with zero acceleration in the tube.

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Deependra Verma

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