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Q.

A current through a horizontal power line flows from South to North direction. The direction of magnetic field lines 0.5 m above the power line is


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a

North

b

South

c

West

d

East 

answer is D.

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Detailed Solution

The direction of magnetic field lines 0.5 m above the power line is East.
“By using the right-hand thumb rule, the direction of the thumb shows current, the folded fingers show the direction of the magnetic field.” As the direction of the current is from south to north, the direction of magnetic field lines 0.5 m above it is in the east direction.
 
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