Q.

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

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a

Remain stationary

b

Is attracted towards the electromagnet

c

Jumps out of the core

d

None of the above

answer is C.

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