First slide

Magnetic flux and induced emf

Question

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

Moderate

A

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

If I decrease, A will repel B
C

If I increases, A will attract B
D

If I increases, A will repel B

Solution

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

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