First slide

Lenz's law and conservation of energy

Question

A conducting ring is placed around the core of an electromagnet as shown in figure. When key K is pressed, the ring

Moderate

A

Remains stationary
B

Is attracted towards the electromagnet
C

Jumps out of the core
D

None of the above

Solution

When key K is pressed, current through the electromagnet starts increasing, i.e., flux linked with ring increases which produces repulsion effect.

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