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A short magnetic needle is pivoted in a uniform magnetic field of induction $1 \mathrm{~T}$. Now, simultaneously another magnetic field of induction $\sqrt{3} \mathrm{~T}$ is applied at right angles to the first field; the needle deflects through an angle $\theta$ whose value is
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The correct answer is:
$60^{\circ}$
In balance condition $B_2=B_1 \tan \theta$
or $\quad \tan \theta=\frac{\sqrt{3}}{1}=\sqrt{3}$
$\theta=60^{\circ}$
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