A) 0.2 J
B) - 0.2 J
C) zero
D) None of these
Correct Answer: B
Solution :
Given, magnetic moment, \[\operatorname{M}\,\,= 0.5 J{{T}^{-}}^{1}\] magnetic field, \[\operatorname{B} = 0.4 T\] Now, potential energy \[\operatorname{U}=\,\,-\overline{M}\,\cdot \overline{B}\,\,=\,\,-MB\,\,cos\,\theta \] For stable equilibrium, \[\theta =0{}^\circ \] \[\therefore \,\,\,\,\,\operatorname{U}= -MB=- \left( 0.5 \right) \times \left( 0.4 \right)\,\,=\,\,- 0.2 J\]You need to login to perform this action.
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