Question

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

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 1

Correct Answer - D

If currnet through A increase, magnetic field (x) linked with coil B increase. Hence, anti-clockwise current induces in coil B. As shown in figure both the currents produce repulsive effect.