Refer to the drawing that accompanies this problem. Suppose that the voltage of the battery in the circuit is 4.33 V, the magnitude of the magnetic field (directed perpendicularly into the plane ofthe paper) is 0.578 T, and the length of the rod between the railsis 0.278 m. Assuming that the rails are very long and have negligible resistance, find the maximum speed attained by the rod after the switch is closed.