Question

Two straight current-carrying conductors (A) and (B) are shown in the figures below:

1. Mark the direction of the magnetic fields around these current-carrying conductors (A) and (B).
2. Compare the strengths of magnetic fields produced (1) at points P and Q and (2) at points Q and R due to these current-carrying conductors, qualitatively.

Answer 1

I.

II. (1) For P and Q, the distance is the same, but the current is different.

B × I

So, B_Q > B_P

(2) Between Q and R, the current is the same, but the distance is different.

B × `1/d`

B_Q > B_R