Halliday, Resnick & Walker — Induction and Inductance: Problem 71

71 In Fig. 30-54, a circular loop of wire 10 cm in diameter (seen edge-on) is placed with its normal \(\vec{N}\) at an angle \(\theta = 20^{\circ}\) with the direction of a uniform magnetic field \(\vec{B}\) of magnitude 1.5 T. The loop is then rotated such that \(\vec{N}\) rotates in a cone about the field direction at the rate 100 rev/min; angle \(\theta\) remains unchanged during the process. What is the emf induced in the loop?