Question: A delivery truck with 2.5 {\rm m}-high aluminum sides is driving west at 60 {\rm km/hr} in a region where the earth's magnetic field is \vec {\rm B}\; =\; (5.0 \times10^{-5}\;{\rm T},\; {\rm north})
a. What is the potential difference between the top and the bottom of the truck's side panels?
b. Will the tops of the panels be positive or negative relative to the bottoms? positive or negative