Question

When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain the reason

Answer 1

this phenomenon takes place due to electromagnetic force exerted on it
Due to current the magnetic field is changing constantly resulting into deflection of magnetic needle

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Answer 2

When a current is switched on through a wire, the wire starts behaving as a magnet. Hence, when a compass needle is placed near the given current carrying wire, it gets influenced by the magnetic effect of electric current and gets deflected from its north- south