A wire carrying current I from south to north then passes directly over top of the compass. As a result, the compass needle A) deflects toward the east B) deflects toward the west C) flips around 180 o and points south D) remains undeflected pointing north.
As the current carrying wire carries current in south to north direction, the direction of magnetic field is given by the Right hand thumb rule which is in anticlockwise direction so the magnetic compass deflects towards west.
