A magnet is dropped down an infinitely long vertical copper tube.… - Vidyadip

MCQ

A magnet is dropped down an infinitely long vertical copper tube. Then

A
The magnet moves with continuously decreasing velocity and ultimately comes to rest
✓
The magnet moves with continuously increasing velocity and ultimately aquires a terminal velocity.
C
Magnet moves with continuously increasing velocity and acceleration
D
Magnet moves with continuously increasing velocity but with constant acceleration.

✓

Answer

Correct option: B.

The magnet moves with continuously increasing velocity and ultimately aquires a terminal velocity.

b
If bar magnet is falling vertically through the hollow region of long vertical copper tube (due to 'non-uniform' magnetic field of magnet) change and eddy currents are genrated in the body of the tube by Lenz's law the eddy current opposes the falling of the magnet which therefore experience a retarding fore. the retarding force increase with increasing velocity of the magnet. the magnet then attains a constant final terminal velocity i.e., magnet unlimately falls with zero acceleration in the tube.

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