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If a current is passed through a spring then the spring will

Asked in JEE Main 2002 · Force between parallel currents

(1) expand
(2) compress
(3) remains same
(4) none of these

Answer: (2) compress

Step-by-step solution

Adjacent turns of the spring carry current in the same direction

Parallel currents in the same direction attract, so the turns pull together

Why the other options are wrong

(1) Thinks neighbouring turns carry opposite currents and repel.
(3) Ignores the force between neighbouring turns.
(4) Does not apply the parallel-current rule to the turns.

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