| Assertion (A): Torque on a coil is maximum when it is suspended radially in a magnetic field. |
| Reason (R): Torque tends to rotate a coil. |
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true but R is NOT the correct explanation of A
C) A is true but R is false
D) A is false and R is true
Correct Answer: B
Solution :
| Option [b] is correct. |
| Explanation: The torque on the coil in a magnetic field is given by |
| \[\tau =\operatorname{nIBA} sin\theta \] |
| For radial field, \[\theta \]= \[{{90}^{o}}\] and sin \[\theta \] = 1 |
| Torque = nIBA and it is maximum. |
| So assertion is true. |
| Torque is the rotational equivalence of force. |
| So, torque will tend to rotate a coil. |
| Reason is also true. But reason cannot explain the assertion that why the torque is maximum in the specified position. |
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