A current through a horizontal power line flows in the east to west direction. The direction of the magnetic field at a point directly below it is from ____.

Answer: 

A current through a horizontal power line flows in the east to west direction. The direction of the magnetic field at a point directly below it is from South to north.

Explanation:

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

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