The magnetic N-S line is 10° west of geographical N-S line as shown in the figure. The straight horizontal cable x y is 10° north of east.
Here,
δ = 0° and B = 0.33 G
The horizontal component of the earth’s field
At a point below the cable, the direction of the magnetic field produced is same as that of BH, while at a point above the cable, neutral point lies above the cable. If the distance of the neutral point from the wire is ‘a’, then