Q13 of 805 Page 180

A constant current flows in a horizontal wire in the plane of the paper from east to west as shown in the given Figure. The direction of magnetic field at a point will be North to South

This is according to right hand thumb rule, which states if we hold the current carrying wire in our right hand if thumb will shows direction of current i.e. east to west so direction of magnetic field will be from north to south below the wire.

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