Two straight horizontal parallel wires are carrying the same curr… - Vidyadip

MCQ

Two straight horizontal parallel wires are carrying the same current in the same direction, $d$ is the distance between the wires. You are provided with a small freely suspended magnetic needle. At which of the following positions will the orientation of the needle be independent of the magnitude of the current in the wires

A
At a distance $d/2$ from any of the wires
B
At a distance $d/2$ from any of the wires in the horizontal plane
C
Anywhere on the circumference of a vertical circle of radius $d$ and centre halfway between the wires
✓
At points halfway between the wires in the horizontal plane

✓

Answer

Correct option: D.

At points halfway between the wires in the horizontal plane

d
(d) At these points, the resultant field $ = 0$

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