Two straight horizontal parallel wires are carrying the same current in 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 current in the wires?
At a distance d/2 from any of the wires.
At a distance d/2 from any of the wires,the orientation of the needle be independent of the magnitude of current in the wires; since the lorentz force acting due to the two wires will be equal and in opposite direction.