A current carrying power line carries current from west to east .The direction of magnetic field 1m above is:

north to south

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south to north

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east to west

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west to east

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Solution

The correct option is A north to south
The direction of magnetic field around a straight current carrying wire is given by the direction of curling of fingers of right hand when thumb points towards the direction of current as shown in the figure.
Clearly the magnetic field above the wire carrying current west to east is from north to south.

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