A) \[3\times {{10}^{-2}}N-m\]
B) \[3\times {{10}^{-3}}N-m\]
C) \[1.5\times {{10}^{-3}}N-m\]
D) \[1.5\times {{10}^{-2}}N-m\]
Correct Answer: D
Solution :
[d] Torque on the solenoid is given by \[\tau =MB\,\sin \,\theta \] where \[\theta \] is the angle between the magnetic field and the axis of solenoid. \[M=niA\] \[\therefore \,\,\,\tau =niA\,B\,\sin \,{{30}^{o}}\] \[=2000\times 2\times 1.5\times {{10}^{-4}}\times 5\times {{10}^{-2}}\times \frac{1}{2}\] \[=1.5\times {{10}^{-2}}N-m\]
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