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Two straight horizontal parallel wires a...

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 frelly suspended magnetic needle. At which of the following positions will the orientions of the needle be independent of the magntitude 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

D

At points halfway between the wires in the horizontal plane

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The correct Answer is:
D
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