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Why does a compass needle move if held near a current-carrying wire?
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Why does a compass needle move if held near a current-carrying wire?

User Markdly
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If you hold a compass near a wire through which current is flowing, the needle on the compass will be deflected. Since compasses work by pointing along magnetic field lines, this means that there must be a magnetic field near the wire through which the current is flowing.
User Taliek
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Answer:

If you hold a compass near a wire through which current is flowing, the needle on the compass will be deflected. Since compasses work by pointing along magnetic field lines, this means that there must be a magnetic field near the wire through which the current is flowing.

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User Abhishek Ghimire
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