Regarding the "Faraday's Explanation" section in
<http://en.wikipedia.org/wiki/Faraday_paradox <http://en.wikipedia.org/wiki/Faraday_paradox> >,
I disagree with the statement that:
"According to this model, the Faraday disc should have worked when either the disc or the magnet was rotated...."
Writing in terms of Faraday's model: The two processes are not symmetrical. In one case, spinning disk, there are no magnetic field lines "cutting through" the external wiring. In the other case, spinning magnet, there are magnetic field lines "cutting through" the external wiring. To make the two processes symmetrical, when you spin the magnet, you have to spin the galvanometer and wiring along with the magnet. In other words, spin everything but the disk. Then you'll get the same kind of galvanometer readings that you do when you spin the disk alone.
________________________________
From: phys-l-bounces@carnot.physics.buffalo.edu on behalf of Brian Whatcott
Sent: Wed 10/17/2007 10:29 PM
To: phys-l@carnot.physics.buffalo.edu
Subject: [Phys-l] Faraday Paradox
A rendering of the Faraday paradox from Wiki.
You can tell it came from somebody with physics
background - there is a reference to the Feynman lectures.
:-)