Two hikers are reading a compass under an overhead transmission line that is 5.50 m above the ground and carries a current of 800 A in a horizontal direction from north to south.
a) Find the magnitude and direction of the magnetic field at a point on the ground directly under the conductor.
b) One hiker suggests they walk on another 50 m to avoid inaccurate compass readings caused by the current. Compared to the earth's magnetic field, is the current from the transmission line really a problem?