Question

A constant current I flows in a horizontal wire in the plane of the paper from West to East as shown in the figure. The direction of magnetic field at a point will be South to North

 (1) directly above the wire 

(2) directly below the wire 

(3) at a point located in the plane of the paper, on the north side of the wire. 

(4) at a point located in the plane of the paper, on the south side of the wire.

Answer 1

(2) directly below the wire

Using Maxwell’s right hand thumb rule.