Re: Physics Q (x post)
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Sans the horizontal test, I think a good thing to look at is How Much the magnets curve to one side or the other. I can't imagine friction causing that big a curve for relativley dense magnets. If it's a pronounced curving I'd be more inclined to suspect the magnetowatchamacallit effect. Possibly from some kind of lag in the polarity of one magnet catching up to the polarity of the other.
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The speed of light isn't fast enough these days? From the description they're spinning basically in tandem anyhow. And I'm still unclear on what would break the rotational symmetry of the problem. So basically I think friction is a much more compelling answer.
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