Re: is the magnetic field really moving?

On Tue, 05 Aug 2008 11:55:01 -0700 Salmon Egg <SalmonEgg@[EMAIL PROTECTED]
>
wrote:
| In article 
| <fd598ce8-9d2e-41fa-ab0f-cad8ab98335a@[EMAIL PROTECTED]
>,
| Benj <bjacoby@[EMAIL PROTECTED]
> wrote:
| 
|> In Faraday Generator, if the magnet is stationary and the disk rotates
|> you get an output.
|> Theory: Charges in moving disk move relative to fixed magnetic field
|> producing voltage. Connecting wires do not move with respect to magnet
|> so no induction there. You see a voltage output.
| 
| With my new understanding, I realize that a conductive disk is not 
| necessary. The conduction just makes measurement easier. At any point on

| a rotating insulating disk, there will still be an E field generated by 
| the motion even though no current flows. The E field is a consequence of

| special relativity.
| 
| The electric field will lead to polarization of real atoms and 
| molecules. I would expect it to be very difficult to measure that field 
| using the Stark effect or anything similar.

The conductivity makes it easier to extract power, too (for cases where
there
really is a potential generated).

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