Question

# A current flows in a conductor from east to west. The direction of the magnetic field at a point above the conductor is:

A
towards east
B
towards west
C
towards north
D
towards south
Solution
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#### By right-hand rule, if the right-hand thumb points in the direction of a current, the magnetic field at a point will be given by the direction of curl of fingers at that point. Hence, in this case, as the thumb points from east to west the fingers at a point above will point in the north direction. Hence, a direction of a magnetic field will be towards the north.

6
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