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Question

Assertion :A small coil carrying current, in equilibrium, is perpendicular to the direction of the uniform magnetic field. Reason: Torque is maximum when plane of coil and direction of the magnetic field are parallel to each other.

A
Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
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B
Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
Assertion is incorrect but Reason is correct.
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Solution

The correct option is B Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
The torque acting on a coil is proportional to the angle between the plane of the coil and the direction of magnetic field. When angle =90o, then torque =0. The coil tries to orient itself in this position. Thus in equilibrium, the coil acquires a position, such that its plane makes an angle 90o with the direction of magnetic field.

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