Question
The torque on a current loop is zero if the angle between the positive normal and the magnetic field is either $\theta=0^\circ$ or $\theta=180^\circ$ In which of the two orientations, the equilibrium is stable?
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$\text{F = qE, F = qvB,}$ and $\text{B}=\frac{\mu_0\text{I}}{2\pi\alpha};$
where F is force, q is charge, v is speed, I is current, and a is distance.