| 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 is parallel to each other. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: B
Solution :
The torque acting on a coil is given by \[\tau =nBiA\,\cos \theta \]Where \[\theta \] is the angle between the plane of the coil and the direction of magnetic field. When\[\theta =90{}^\circ \], then\[\tau =0\]. The coil tries to orient itself in this position. Thus in equilibrium, the coil acquire a position, such that its plane makes an angle\[90{}^\circ \]with the direction of magnetic field.
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