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Homework Help: Basic electrostatics's potential difference question.

  1. Oct 18, 2011 #1
    1. The problem statement, all variables and given/known data

    true false

    Work done by external forces in moving a unit positive charge from A at potential Va to B at potential Vb is Vb-Va

    2. Relevant equations

    basic electrostatics.

    3. The attempt at a solution

    dW -F.dr=-Dw
    if a unit charge move from Va to Vb then change in potential energy will Vb-Va. So dV=Vb-Va so dW=Va-Vb
  2. jcsd
  3. Oct 19, 2011 #2
    Sometimes it might help to throw in some numbers. Let Va be 1 volt and let Vb be 2 volts. If we are moving the positive charge from a to b then we are doing work, so it looks like the answer is true?
  4. Oct 20, 2011 #3
    Can you please explain it with proper variable and formulas.
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