Question

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

• A. directly above the wire
• B. directly below the wire
• C. at a point located in the plane of the paper, on the north side of the wire
• D. at a point located in the plane of the paper, on the south side of the wire

Answer 1

The correct option is B directly below the wire

The direction of the magnetic field is perpendicular to the wire and is in the direction the fingers of your right hand would curl if you wrapped them around the wire with your thumb in the direction of the current.

So in this case, the direction of magnetic field from north to south is at point located directly below the wire.