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An aluminum ring B faces an electromagnet A. The current i through A can be altered

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if I increases, A will attract B

whether I increases or decreases, B will not experience any force

if I decrease, A will repel B

if I increases, A will repel B

answer is D.

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Detailed Solution

If current through A increases, change in flux linked with coil B increases, hence anticlockwise current induces in coil B. As shown in the figure both the current produces repulsive effect.

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