| ASSERTION: Torque on the coil is maximum, when coil is suspended in a radial magnetic field. |
| REASON: The torque tends to rotate the coil about its own axis. |
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 on the coil in a magnetic field is given by,\[\tau =nIBA\,\cos \theta \]. For radial field, the coil is set with its plane parallel to the direction of magnetic field B, then \[\theta =0{}^\circ \] and \[\cos \theta =1\]. \[\therefore \]Torque \[=n\,I\,BA\,\left( 1 \right)=nIBA\](maximum).
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