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Two circular coils A and B are facing each other as shown in figure. The current i through A can be altered. Then

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There will be repulsion between A and B if i is increased.

Attraction or repulsion between A and B depends on the direction of current. If does not depend whether the current is increased or decreased.

There will be attraction between A and B if i is increased.

There will be neither attraction nor repulsion when i is changed.

answer is A.

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Detailed Solution

With rise in current in coil A, flux through B increases. According to Lenz's law the induced current will try to decrease the flux linked with br ; hence repulsion occurs between A and B.

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