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Homework Help: Potential inside a resistor

  1. Apr 23, 2010 #1
    1. The problem statement, all variables and given/known data
    Determine the potential [tex]\phi[/tex] 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
    E = J/[tex]\sigma[/tex]
    So V= J/[tex]\sigma[/tex] l ?

    Attached Files:

  2. jcsd
  3. Apr 25, 2010 #2
  4. Apr 25, 2010 #3


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    Homework Helper

    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.
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