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Homework Help: Charges in conductor

  1. May 29, 2014 #1
    1. The problem statement, all variables and given/known data
    Let L be the length of the conductor having uniform cross-section area A and density, let I be the current passing through the conductor. How the total number of positive charge carriers in the conductor of length L is (nAL)?
  2. jcsd
  3. May 29, 2014 #2
    n is just a given constant so naL is just a given too. Do not worry about it. It is just a density times a volume.
  4. May 31, 2014 #3

    rude man

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    n is the volume density of carriers. In other words, there are n carriers per cubic meter if you're using SI units. Your wire volume is AL. So the number of carriers = number per cubic meter n times volume of the wire AL, or there is a total of nAL carriers in the wire.
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