Horizontal electric power lines supported by vertical poles can carry large currents. assume that earth’s magnetic field runs parallel to the surface of the ground from south to north with a magnitude of 0.50×10−4 t and that the supporting poles are 38 m apart. 1) find the magnitude of the force that earth’s magnetic field exerts on a 38-m segment of wire carrying 95 a if the current runs from north to south. (express your answer to two significant figures.)