Electric field in wire with potential

Discussion in 'Physics' started by h2opolo, Mar 26, 2014.

  1. h2opolo

    Thread Starter Member

    Aug 2, 2013
    38
    0
    I was reading a problem that gave:

    Potential
    Resistivity
    Length of wire
    Radius of wire

    It asked for current:

    Current=(area*potential)/(resistivity/length)

    Then it asked for electric field in the wire

    Can you say

    Ed=V.... E=V/d?

    Is that the same as E=(resistivity)(current density)... E=ρj; j=I/A
     
  2. studiot

    AAC Fanatic!

    Nov 9, 2007
    5,005
    513
    What is d in your equation?

    And what is the direction of the electric field in the wire, ie which way does the current flow?
     
  3. h2opolo

    Thread Starter Member

    Aug 2, 2013
    38
    0
    d is length of the wire. The problem is not set up on a coordinate system with a frame of reference. The direction of current is just opposite of the direction the electron flow. I found out that those two equations come out with the same answer.
     
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