Question

Equal currents are flowing in two infintely long wires lying along x and y axes in the directions shown in figure.Match the following two columns.

Answer 1

The magnitude of magnetic field is same for both the wires at those points.

For direction we use flamenco's right hand rule which states that

to find the direction of the magnetic force on a positive moving charge, the thumb of the right thumb point in the direction of $v$, the fingers in the direction of B, and the force is directed perpendicular to the right hand palm.

$A-2$

$B-2$

$C-4$

$D-4$