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A rectangular wire of width a and height b is connected to a current source, that...

A rectangular wire of width a and height b is connected to a current source, that when turned on, give rise to a current I in the wire. The loop is suspended in a uniform magnetic field B that points in a vertical direction, and it will hang vertically if there was no current. We assume that the wire is massless, but two spheres of mass m are suspended at the lower corners. What is the angle θ at which the loop is in equilibrium? Calculate this in two ways (a) Using torques and (b) by expressing the potential energy as a function of θ and minimizing it.

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