Effect of Transmission Lines. 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 directiy under the conductor.
(b) One hiker suggests they walk on another 50 m to avoid inaccurate compass readings caused by the current. Considering that the magnitude of the earth's field is of the order of 0.5 X 104 T, is the current really a problem?