A) 1
B) 11
C) 36
D) 1060
Correct Answer: B
Solution :
[b] We know that, magnetic dipole moment \[M=NiA\,\cos \,\theta \] i.e., \[M\propto \,\cos \,\theta \] When two magnetic fields are inclined at an angle of \[75{}^\circ \] the equilibrium will be at \[39{}^\circ \], so \[\cos \theta =\cos \,(75{}^\circ -30{}^\circ )=\,\cos \,45{}^\circ =\frac{1}{\sqrt{2}}\] \[\frac{x}{\sqrt{2}}=\frac{15}{2}\,\,\therefore \,\,\,x\approx 11\]You need to login to perform this action.
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