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Question
When altemating current passes through a spring then it:-
When altemating current passes through a spring then it:-
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Solution
The correct option is A contracts
when an A.C. is passed
through a metallic spring it starts oscillating whereas when D.C. is passed it contracts.
The reason is simple. When DC is passed through the spring all turns become
magnet with faces having N, S, N, S polarities and therefore each turn attracts
each other and the spring Contracts .In case of an AC , now it is not difficult
to understand the the polarities will go on changing say from N to S and S to N
alternatively because of the alternating current. This makes the staring to
contract and expand alternatively too.
when an A.C. is passed through a metallic spring it starts oscillating whereas when D.C. is passed it contracts. The reason is simple. When DC is passed through the spring all turns become magnet with faces having N, S, N, S polarities and therefore each turn attracts each other and the spring Contracts .In case of an AC , now it is not difficult to understand the the polarities will go on changing say from N to S and S to N alternatively because of the alternating current. This makes the staring to contract and expand alternatively too.
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