A) \[-\,0.64\,J\]
B) zero
C) \[-\text{ }0.082\,J\]
D) \[0.064\text{ }J\]
Correct Answer: D
Solution :
| [d] We know that \[U=-MB\cos \theta \] |
| For stable equilibrium \[\theta ={{0}^{o}}\] |
| So, \[U=-MB\] |
| \[=-(0.4)(0.16)=-0.064\,J\] |
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