Q.

An Aluminium ring B faces an electromagnet A. The current I through A can be altered. Then

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a

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

b

If I decreases, A will repel B

c

If I increases, A will attract B

d

If I increases, A will repel B

answer is D.

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Detailed Solution

If current through A increases, magnetic field linked with coil B increases, hence anticlockwise current induces in coil B. As shown in figure, both the current produce repulsive effect.
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An Aluminium ring B faces an electromagnet A. The current I through A can be altered. Then