A high-voltage power line carries a current of 110 A at a locationwhere the Earth's magnetic field has a magnitude of 0.59 G andpoints to the north, 72 degrees below the horixontal. Find the direction and magnitydeo f the magnetic force exertes on a 250-mlength of wire if the current in the wire flows
a. horizontally toward the east or
b. horizontally toward the south