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Q.

If current is passed in a spring with a weight hung on it, then the spring

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a

will expand

b

will be compressed

c

compression and expansion both will occur

d

there will be no change in state of compression

answer is A.

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Detailed Solution

Two parallel ends of the conductors which each carry a current in the same direction will attract one another, while two such conductors which carry current in the opposite direction will repel each other. So current carrying spring will be compressed

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If current is passed in a spring with a weight hung on it, then the spring