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

Options

A. wheter `I` increases or decreases, `B` will not experience any force
B. If `I` decreases, `A` will repel `B`
C. If `I` increasing , `A` will attract `B`
D. If `I` increasing , `A` will repel `B`

Answer

D

Explanation

If current through `A` increase, crosses `(XX)` linked with coil `B` increase, hence anticlockwise current induces in coil `B`. As shown in figure both the current produces repulsive effect.