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 Tesla and that the supporting poles are 38 m apart.

Question

Find the magnitude and direction of the force that Earth’s magnetic field exerts on a 33-m segment of wire carrying 65 A if the current runs toward the northwest making an angle of 30 degrees north of east

Answer 1

when you get the geometry figured out look at:
http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/forwir2.html