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Re: IONS/forces



Ludwik,
Are you sure that this isn't sqr(2)*R; (not 2*R)? Or do I misread you. I
figured this way:

dF = dA*sigma^2/(2eps) = (sigma/2eps)*sigma*dA =
{ (Q/4*Pi*R^2)/(2*eps) }*dQ =(Q*dQ)/(4*Pi*eps*2*R^2),

which is the force between a Q and a dQ separated by R*sqr(2).

Bob Sciamanda
Physics, Edinboro Univ of PA (ret)
trebor@velocity.net
http://www.velocity.net/~trebor

-----Original Message-----
From: Ludwik Kowalski <kowalskiL@Mail.Montclair.edu>
To: phys-l@atlantis.uwf.edu <phys-l@atlantis.uwf.edu>
Date: Saturday, October 31, 1998 10:46 PM
Subject: Re: IONS/forces


. . .. It turns out that the net force on the probe
charge dQ, when it is in the middle of the opening (at d=R from
the center), is exactly the same as if the remaining charge, Q-dQ,
were concentrated at one point 2*R away (on the opposite end of
the diameter). . . . . . . . . . . . . . . .*****

Ludwik Kowalski