A circular coil with area A and N turns is free to rotate about a diameter that coincides with the x-axis. Current I is circulating in the coil. There is a uniform magnetic field B in the positive y-direction. Calculate the magnitude and direction of the torque T and the value of the potential energy U, as given in Eq. (27.27), when the coil is oriented as shown in parts
(a) Through (d) of Fig.

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(a) (b) (C) (d)