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From: friesen@psivax.UUCP (Stanley Friesen)
Newsgroups: net.physics
Subject: Re: Quantum electrodynamics and Feynman diagrams
Message-ID: <790@psivax.UUCP>
Date: Fri, 11-Oct-85 16:21:48 EDT
Article-I.D.: psivax.790
Posted: Fri Oct 11 16:21:48 1985
Date-Received: Tue, 15-Oct-85 10:41:51 EDT
References: <326@bcsaic.UUCP>
Reply-To: friesen@psivax.UUCP (Stanley Friesen)
Organization: Pacesetter Systems Inc., Sylmar, CA
Lines: 19
Summary: 

In article <326@bcsaic.UUCP> michaelm@bcsaic.UUCP (michael b maxwell) writes:
>
>Then came the crunch.  How do you explain attractive forces?  I.e. what
>happens when you replace one of the e-s with a positive particle?  It
>seems to me that there ought to be an attactive force, but I can't figure
>how exchanging a photon can result in a force of attraction!  Putting it
>naively, when a virtual photon arrives at an e-, how does it "know"
>whether it came from an e- or an e+?
>
	Hey, yeah, he's not the only one! How *does* this work?
Why can't the physics text cover this case as well? I think the
attraction of opposite charges is more interesting than scattering
anyway!
-- 

				Sarima (Stanley Friesen)

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