Bob Sciamanda
Physics, Edinboro Univ of PA (em)
treborsciamanda@gmail.com
www.sciamanda.com
Forwarded Conversation
Subject: Can you please post this electrostatics question to Phys-L
listserv?
------------------------
From: Jane Jackson <jane.jackson@asu.edu>
Date: Wed, Jan 30, 2019 at 9:32 PM
To: treborsciamanda@gmail.com <treborsciamanda@gmail.com>
Bob,
Today an engineer colleague wrote me the note below. I wish that I could
post it on phys-L, because I am overworked and have no time to think it
out. However, for some strange reason I still cannot post to phys-L --
although I can read the archives.
Thus, will you please post it for me?
An engineer colleague wrote me today:
"I am struggling with a problem in electrostatics I was asked, and I find
it a brain teaser.
'Does an operating high speed commercial ultracentrifuge produce an
electric field between the rotor hub and the sample holder because
electrons are flung outward? The centrifuge develops 100.000 g's (quite a
large acceleration).'
I suggested the answer was yes in that there is a free electron gas
within the metal and these would be influenced by centrifugal force [in the
rotating reference frame, of course]. I'm guessing that it's determined
in value as being the strength of the electric field that balances the
outward centrifugal force. But I can't determine how to prove this or
calculate a result. Also I can't find anything on the web about this.
Any thoughts?"
peace,
Jane Jackson, Co-Director, ASU Modeling Instruction Prgm
Box 871504, Dept.of Physics, ASU, Tempe, AZ 85287
480-965-8438/480-314-1522. The URL is modeling.asu.edu
Jane.Jackson@asu.edu * I care. Do you?*
----------
From: Jane Jackson <jane.jackson@asu.edu>
Date: Thu, Jan 31, 2019 at 12:13 PM
To: Bob Sciamanda <treborsciamanda@gmail.com>
Thanks, Bob: much appreciated.
peace,
Jane Jackson, Co-Director, ASU Modeling Instruction Prgm
Box 871504, Dept.of Physics, ASU, Tempe, AZ 85287
480-965-8438/480-314-1522. The URL is modeling.asu.edu
Jane.Jackson@asu.edu * I care. Do you?*
------------------------------
*From:* Bob Sciamanda <treborsciamanda@gmail.com>
*Sent:* Wednesday, January 30, 2019 11:09 PM
*To:* Jane Jackson
*Subject:* Re: Can you please post this electrostatics question to Phys-L
listserv?