Question

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

Answer 1

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.