A current through a horizontal power line flows in north to south direction. What is the direction of magnetic field (i) at a point directly below it and (ii) at a point directly above it?

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Solution

The current through a horizontal power line flows in the north to south direction.
Applying the right-hand thumb rule, we get that the direction of the magnetic field at a point below the wire is from west to east.
The direction of the magnetic field at a point directly above the wire is from east to west.

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Question 9
A constant current flows in a horizontal wire in the plane of the paper from east to west as shown in figure. The direction of magnetic field at a point will be north to south

(a) directly above the wire
(b) directly below the wire
(c) at a point located in the plane of the paper, on the north side of the wire
(d) at a point located in the plane of the paper, on the south side of the wire

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