A high-voltage power line carries a current of 110 A at a location where the Earth's magnetic

Question:

A high-voltage power line carries a current of 110 A at a location where the Earth's magnetic field has a magnitude of 0.59 G and points to the north, 72° below the horizontal. Find the direction and magnitude of the magnetic force exerted on a 250-m length of wire if the current in the wire flows

(a) Horizontally toward the east

(b) Horizontally toward the south.