A) \[2\times {{10}^{-2}}Am\]
B) \[5\times {{10}^{-2}}Am\]
C) \[2\,Am\]
D) \[5\,Am\]
Correct Answer: A
Solution :
We know that, torque \[\tau \,=MB\sin \theta \] \[\Rightarrow \,\,\tau \,=(ml)\,B\sin \theta \] \[\Rightarrow \,\,25\,\times {{10}^{-6}}\,=(m\times 5\times {{10}^{-2}})\,\times 5\times {{10}^{-2}}\,\times \sin {{30}^{0}}\] \[\Rightarrow \,\,m=2\times {{10}^{-2}}\,Am\]You need to login to perform this action.
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