4) A circular coil with area A and N turn 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 torque and the value of the potential energy U, as given in the equation; "U = - µ. B = -µB cos(theta)"; when the coil is oriented as shown in part a through d of figure below. (SEE ATTACHMENT)
A current carrying coil is placed in a magnetic field. The torque on it and the potential energy of the system is calculated.