A horizontal overhead power line carries a current of 90 A in the east to west direction. What is the magnitude and direction of the magnetic field due to the current 1.5 m below the line?

(I) = 90 A is the magnitude of the current in the power line.

The point is placed at (r) = 1.5 m below the electrical cable.

As a result, the magnetic field at that location may be computed as follows:

where,

Permeability of free space 

Substituting values in the above equation, we get

The movement of the current is from east to west. The point is located beneath the electrical cord.

As a result, the magnetic field is oriented southward according to Maxwell’s right-hand thumb rule.