Twocircular coils A and B are placed closed to each other. If thecurrent in the coil A is changed, will some current be induced in thecoil B? Give reason.

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Solution

Twocircular coils A and B are placed close to each other.When the current in coil A is changed, the magnetic fieldassociated with it also changes. As a result, the magnetic fieldaround coil B also changes. This change in magnetic fieldlines around coil B induces an electric current in it. This iscalled electromagnetic induction.

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(b) State the rule to determine the direction of a:
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