A) a circular loop, coaxial with the solenoid
B) a rectangular loop in a plane perpendicular to the axis of the solenoid
C) a rectangular loop in a plane containing the axis of the solenoid, the loop being totally within the solenoid
D) a rectangular loop in a plane containing the axis of the solenoid, the loop being partly inside the solenoid and partly outside it
Correct Answer: D
Solution :
When a current carrying coil is placed in a uniform magnetic field B, then torque, \[\tau =MB\,\,\sin \theta \] \[\tau =(NIA)\,B\,\sin \,\theta \] \[\tau =10\times 1\times 0.2\times 6\times {{10}^{-4}}\times \sin \,{{30}^{o}}\] \[=10\times 1\times 0.2\times 6\times {{10}^{-4}}\times \frac{1}{2}\] \[=6\times {{10}^{-4}}\,N-m\]
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