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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