A) 12 J
B) 6 J
C) 2 J
D) 0.6 J
Correct Answer: B
Solution :
[b] Work done\[=MB(\cos \,{{\theta }_{1}}-\cos \,{{\theta }_{2}})\] \[=MB(\cos \,{{0}^{o}}-\cos \,{{60}^{o}})\] \[=MB\left( 1-\frac{1}{2} \right)=\frac{2\times {{10}^{4}}\times 6\times {{10}^{-4}}}{2}=6\,J\]You need to login to perform this action.
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