# A circular coil of radius 8.0 cm and 20 turns rotates about its vertical diameter with an angular speed of $50 rad s^{-1}$ in a uniform horizontal magnetic field of magnitude $3 \times 10^{-2} T$. It the coil forms a closed loop of resistance $10 \Omega$, calculate the power dissipated as heat.
(a) $0.018 W$ (b) $0.18 W$ (c) $0.081W$ (d) $0.81W$