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Re: [Phys-l] Poynting Vector



On 06/30/2008 11:05 AM, I wrote:

/Derivatives/ of A act directly on the charges.

That's narrowly true ... but misleading. Sometimes A itself acts
directly on charged particles:

http://en.wikipedia.org/wiki/Aharonov-Bohm_effect

A lot of students find this counterintuitive.