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When the current is switched on through ...

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

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### Step-by-Step Solution: 1. **Understanding Current Flow**: When electric current flows through a wire, it generates a magnetic field around it. This is due to the movement of charged particles (electrons) in the wire. 2. **Magnetic Nature of the Wire**: The wire, when current passes through it, behaves like a magnet. This phenomenon is a result of Ampère's circuital law, which states that an electric current produces a magnetic field. 3. **Effect on Compass Needle**: A compass needle is a small magnet that aligns itself with the Earth's magnetic field. When the wire is energized (current is switched on), the magnetic field created by the current in the wire interacts with the magnetic field of the compass needle. ...
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