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Q & A: magnetoresistance

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Most recent answer: 10/22/2007
Q:
What affect will a magnet on or around an ac power cord have on the flow of electricity.
- Mike
Harper Woods Mi
A:
Very little. In a magnetic field from a strong permanent magnet, the resistance of ordinary copper wires changes, but not enough to make any practical difference. There's also a small voltage generated sideways in the wire (the Hall voltage) but again in this case it would have no practical significance.

Mike W.

(published on 10/22/2007)

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