A) \[\text{1}.\text{5}\times \text{l}{{\text{0}}^{-5}}\text{N}-\text{m}\]
B) \[\text{1}.\text{5}\times \text{l}{{\text{0}}^{-3}}\text{N}-\text{m}\]
C) \[\text{1}.\text{5}\times \text{l}{{\text{0}}^{-2}}\text{N}-\text{m}\]
D) \[\text{1}.\text{5}\times \text{l}{{\text{0}}^{-6}}\text{N}-\text{m}\]
Correct Answer: A
Solution :
\[C=MB\,\sin \theta \] \[=(m\times 2l)\times 2\times {{10}^{-5}}\times \sin {{30}^{o}}\] \[=15\times 10\times {{10}^{-2}}\times 2\times {{10}^{-5}}\times \frac{1}{2}\] \[=1.5\times {{10}^{-5}}N-m\]
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