Home Physics Moving Charge and Magnetism Biot-Savart's Law and Amperes Law Two straight horizontal parallel wires are c…
Physics Moving Charge and Magnetism Biot-Savart's Law and Amperes Law MCQ (Single Correct)

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 center halfway between the wires
D
At points halfway between the wires in the horizontal plane

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The correct answer is:
D

At these points, the resultant field = 0

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