Question

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
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 points halfway between the wires in the horizontal plane.

b.Anywhere on the circumference of a vertical circle of radius d and center hallway between the wires

c.At a distance d/2 from any of the wires.

d.At a distance d/2 from any of the wires in the horizontal plane​

Answer 1

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

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 points halfway between the wires in the horizontal plane.

b.Anywhere on the circumference of a vertical circle of radius d and center hallway between the wires

c.At a distance d/2 from any of the wires.