A) \[1.15\,\mu J\]
B) \[9.1\,\mu J\]
C) \[4.55\,\mu J\]
D) \[2.3\,\mu J\]
Correct Answer: B
Solution :
| [b] \[W=MB(cos{{\theta }_{1}}-cos{{\theta }_{2}})\] |
| When it is rotated by angle \[{{180}^{o}}\] then |
| \[W=2MB\] |
| \[W=2(NIA)B\] |
| \[=2\times 250\times 85\times {{10}^{-6}}[1.25\times 2.1\times {{10}^{-4}}]\times 85\] |
| \[\times {{10}^{-2}}\] |
| \[=9.1\,\mu J\] |
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