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A friend of mine claims to have been able to surf the Internet without fuss on a Wi-Fi connection while performing NMR on samples he was analyzing. I would have thought the strong magnets needed for this would have washed out Wi-Fi signals due to the radio waves emitted.

How plausible is his claim?

Or, to be more general, what kind of (electro?)magnet would it take to interfere with mobile devices?

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The frequencies at least have to be in a similar range. – Cedric H. Nov 19 '10 at 11:58
Yes, unfortunately I had neglected to ask how strong (flux density in gauss/tesla) their magnets are and what channel he was using for Wi-Fi. But it would look from your comment that there was no frequency overlap for crosstalk to happen, I guess. :) – user172 Nov 19 '10 at 12:01
up vote 15 down vote accepted

In NMR, the strong magnets set the frequency of the nuclear resonance, using the constant magnetic field.

Typically the resonance radio waves are around the MHz frequencies whereas Wi-Fi is around 2.5GHz. When the frequencies are different, they don't disrupt each other's signals.

Electro-magnets wouldn't interfere, as it is a constant field produced rather than an elecromagnetic wave, and even then it would have to be at the same frequency.

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Thanks for this. :) – user172 Nov 19 '10 at 12:09

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