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Questions  

Figure shows a powerful electromagnet arrangement. A copper ring, which is free to move, is Placed on the projecting part of the core as shown. When the key is inserted, the ring

a
is thrown up
b
remains stationary
c
sticks to the core
d
slips down along the core

detailed solution

Correct option is A

Flux through the ring increases in upward direction. To oppose the same, it is thrown up. As the ring moves up, the intensity of magnetic field due to electromagnet at upper points is less since B∝1r3

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