In an experiment designed to measure the Earth's magnetic field using the Hall effect, a copper bar t = m thick is positioned along an east-west direction. Assume n = electrons/m3 and the plane of the bar is rotated to be perpendicular to the direction of B S. If a current of i = A in the conductor results in a Hall voltage of v = V, what is the magnitude of the Earth's magnetic field at this location?
q =