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The torque acting on a magnetic dipole placed in uniform magnetic field is zero, when the angle between the dipole axis and the magnetic field is
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Zero
Given, $\tau=0$
$\begin{aligned} \Rightarrow M B \sin \theta & =0 \Rightarrow \sin \theta=0 \\ \Rightarrow \quad \theta & =0^{\circ}\end{aligned}$
$\begin{aligned} \Rightarrow M B \sin \theta & =0 \Rightarrow \sin \theta=0 \\ \Rightarrow \quad \theta & =0^{\circ}\end{aligned}$
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