# 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.