Categories > Moving Charges and Magnetism > Biot-Savart's Law > 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

Moving Charges and Magnetism

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 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


1) At a distance $d/2$ from any of the wires
2) At a distance $d/2$ from any of the wires in the horizontal plane
3) Anywhere on the circumference of a vertical circle of radius $d$ and centre halfway between the wires
4) At points halfway between the wires in the horizontal plane
Solution: Explanation: No Explanation
Biot-Savart's Law Amperes Law

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