First slide

Magnetic flux and induced emf

Question

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

Moderate

A

Remain 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 start increasing i.e. flux linked with ring increases which produces repulsion effect.

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