First slide

Lenz's law and conservation of energy

Question

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

Moderate

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

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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