Re: [Phys-L] feeler-dealer, third law, et cetera

[brian whatcott <betwys1@sbcglobal.net>]

On 12/12/2013 11:48 AM, John Denker wrote:
> /snip/ There is momentum in the electromagnetic field./snip/  The 
> energy flow and the momentum density go like E×B so unless you have an 
> E-field /and/ a B-field you can postpone worrying about it. /snip/

This nudged a little pocket of fancied insight. I had it that an 
electric field and a magnetic field  can commutate depending on the 
choice of some frame of reference...

Brian Whatcott    Altus OK