Question

Why does a magnetic needle show deflection when brought close to a current carrying conductor?

Answer 1

When a magnetic needle is brought closer to a current carrying conductor then the magnetic needle it gets deflected because the magnetic field of the current carrying conductor exerts a force on the magnetic needle, making it move from one direction to the other.

This force is proportional to the magnitude of current passing through the conductor.

Answer 2

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The $\sf{\bold{compass\:needle}}$ is a small magnet. When the compass needle is brought close to a bar magnet, the magnetic field lines of the compass needle interact with the magnetic field lines of bar magnet, which causes the compass needle to deflect.

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