Potential inside a resistor

1. Apr 23, 2010

likephysics

1. The problem statement, all variables and given/known data
Determine the potential $$\phi$$ inside a resistor of length l and radius a.
Also determine the current density J, resistance R, surface and volume charge density Pe and Pes. The resistor is homogeneous.

2. Relevant equations

3. The attempt at a solution
V=Ed, d=l here
V=El
E = J/$$\sigma$$
So V= J/$$\sigma$$ l ?

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2. Apr 25, 2010

likephysics

Anyone?

3. Apr 25, 2010

diazona

With your attempt so far, you can find the electric field. Then use that to compute the potential difference between one end of the resistor and a point somewhere in the middle. That should get you started.