Answer
0.65 mV; East or west
Work Step by Step
The car’s antenna is vertical. The maximum emf occurs when the car traves perpendicular to the horizontal component of the Earth’s magnetic field. The car is traveling either east or west.
Calculate the magnitude of the emf using equation 21–3, where the field to use is the horizontal component of the Earth’s magnetic field.
$$\epsilon=B_x\mathcal{l}v=((5.0\times10^{-5}T)cos38^{\circ})(0.55m)(30.0m/s)$$
$$=0.65mV$$
