PY212 Solutions Quiz 6 (a) The torque is given by B r r r × = μ τ and therefore the magnitude of the torque is equal to θ sin B = . Here θ is the angle between B r and the dipole moment r (which is a vector perpendicular to the plane of the loop; see Fig. 28-24). If the torque on the coil is maximized, we must have sin θ = 1, i.e. θ = 90 ° . (b) If N closed loops are formed from the wire of length L , the circumference of each loop is L / N , the radius of each loop is R = L /2 π N , and the area of each loop is
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