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Question
Physics
If a magnet is dropped through a vertical hollow copper tube then
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Q. If a magnet is dropped through a vertical hollow copper tube then
KEAM
KEAM 2017
Electromagnetic Induction
A
the time taken to reach the ground is longer than the time taken if the tube was made out of plastic
17%
B
the magnet will get attracted and stick to the copper tube
15%
C
the time taken to reach the ground is longer than the time taken if the tube was made out of stainless steel
14%
D
the time taken to reach the ground does not depend on the radius of the copper tube
49%
E
the magnet will be repelled away by the tube
49%
Solution:
When the magnet is dropped in a hollow copper tube vertically, Emf is induced in tube and this pushes the magnet upward. But for plastic tube, no such emf is induced.