| Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as: |
| Assertion [A]: Torque on the coil is the maximum, when coil is suspended in a radial magnetic field. |
| Reason (R): The torque tends to rotate the coil on its own axis. |
A) Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A]
B) Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A]
C) Assertion [A] is true but Reason (R) is false
D) Assertion [A] is false and Reason (R) is also false
Correct Answer: B
Solution :
[b] The torque on the coil in a magnetic field is given by; \[\tau =n/BA\,\cos \theta \] For radial field, the coil is set with its plane parallel to the direction of the magnetic field B, then \[\theta =0{}^\circ \] and \[cos\,\theta =1\]. \[\Rightarrow \] Torque \[=nl\,BA(1)=nl\,BA\] (maximum).
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