Question

Two infinitely long wires carrying current are as shown in the Fig below. One wire is in the y-z plane and parallel to the y-axis. The other wire is in the x-y plane and parallel to the x-axis. Which components of the resulting magnetic field are non-zero at the origin?

(a) x, y, z components 

(b) x, y components 

(c) y, z components 

(d) x, z components

Answer 1

Correct option (d)

Explanation:

When a current I flows in a closed circuits, the magnetic field strength H at any point is a result of this current flow

R is the unit vector in direction of R. The direction of H is perpendicular to the plane containing Idl and R.in the direction in which right hand screw would move in turning from Idl to R. The first current element is in Y direction and R is in Z direction. H is in X direction. 

The second current element is in X direction and R is in Y direction. H is in Z direction