Assignment:
A power line is 3.5m off the ground and is carrying 75 amps. A man standing under the power line is holding a compass 1.25m off the ground.
1) How large is the magnetic field produced on the compass by the power line?
2) If the power line runs east and west, how does its magnetic field affect the direction in which the compass points?
3) If the power line runs north-south, how does the magnitic field affect the direction in which the compass points?