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In which region is it possible for electric potential = 0?

  1. Feb 2, 2015 #1
    Two charges that are shown:
    I (4uC) II (-2uC) III
    In which regions all the line connecting the charges is it possible for the electric potential to be zero?

    1. The problem statement, all variables and given/known data

    They are 0.01m apart

    2. Relevant equations


    3. The attempt at a solution
    I understand that the 4uC charge and the -2uC charge are going to attract...but I have no idea where the potential could be equal to zero.
     
  2. jcsd
  3. Feb 2, 2015 #2

    Simon Bridge

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    Hint:
    What is the equation for the electric potential of a point charge?
    What si the rule for combining electric potentials?
     
  4. Feb 2, 2015 #3
    V= kQ/r

    and I'm not sure...
     
  5. Feb 2, 2015 #4

    Simon Bridge

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    Indeed ##V(\vec r)=kQ/r## for a point charge ##Q## at the origin.
    If you have two or more charges, then the electric potentials add up.
     
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