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-   -   Current Concentrated Along Axis (http://www.physicsforums.com/showthread.php?t=657945)

ResonantW Dec9-12 11:58 PM

Current Concentrated Along Axis
 
Griffiths brings up a point that it might make sense that current in a fat wire would want to concentrate itself mainly along the axis of the wire, given that parallel wires attract each other.

He then asks us to figure out why this might not happen, but to be honest I would think it should! The only thing I can think of is some sort of electric repulsion in the conduction particles' rest frame, but I feel like there are more subtle points in transforming the frames like this. Where am I going wrong?

davenn Dec10-12 02:02 AM

Re: Current Concentrated Along Axis
 
hi there :)

who is Griffiths and do you have a link to his study ?

Dave

Meir Achuz Dec12-12 12:52 PM

Re: Current Concentrated Along Axis
 
That would give j a curl. Since j=\sigma E, that would give E a curl, but curl E=0.


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