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A circular coil with area A and N turns is free to rotateabout a diameter that...

A circular coil with area A and N turns is free to rotateabout a diameter that coincides with the x-axis. Current I iscirculating in the coil. There is a uniform magnetic field B in thepositive y-direction. Calculate the magnitude and direction of thetorque τ and the value of the potential energy U, as given inEq. 27.27 (U=-μ x B = -μBcosφ), when the coil isoriented as shown in parts (a) through (d).
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