A current carrying circular wire is introduced in a uniform magnetic field perpendicular to its plane. Then the potential energy of the wire

increases.

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decreases.

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remains same.

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Solution

The correct option is A increases.
The direction of magnetic force exerted on any small element of the wire is away from the centre.This causes increase in a potential energy of the wire.

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A circular loop of radius R carrying a current I is placed in a uniform magnetic field with its plane perpendicular to B. The force on the loop is :

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I_{0}

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