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Question

A current through a horizontal power line flows in east to west direction. What is the direction of magnetic field at a point directly below it and at a point directly above it?


A
The direction of magnetic field at a point below the wire is from north to south. The direction of magnetic field at a point directly above the wire is from south to north.
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B
The direction of magnetic field at a point below the wire is from south to north. The direction of magnetic field at a point directly above the wire is from north to south.
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C
The direction of magnetic field at a point below the wire is from east to west . The direction of magnetic field at a point directly above the wire is from west to east.
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D
The direction of magnetic field at a point below the wire is from west to east. The direction of magnetic field at a point directly above the wire is from east to west
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Solution

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

Physics

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