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.