Question

Why does the compass needle get deflected when brought near a current - carrying wires?

Answer 1

the compass needle gets deflected as magnetic effect is produced in the current carrying wires..

Answer 2

$\bigstar\sf\purple{Answer}\bigstar$

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.