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Homework Help: How much work is done. Physics problem

  1. Feb 14, 2009 #1

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

    1. A +38 uC charge is place @ 41cm from an identical +38uC. If assuming the potential identity is 0. whats the potential midway btw the 2 charges?
    2. How much work is done to move a 0.40 uC charge from a point midway between the charge to a point 10 cm closer to either of the charges?

    2. Relevant equations

    V= m/q ?
    F= Ke qq/r

    3. The attempt at a solution
    Not sure where to start but....
    8.99e-19(38e-6)(q3)/(.041m-x )^2
    8.99e-19(38e-6)(q3)/(x )^2
  2. jcsd
  3. Feb 14, 2009 #2


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    Homework Helper

    Re: #9

    Simply calculate the ΔV because that times q is your work.
  4. Feb 14, 2009 #3
    Re: #9

    so i used V= Ke q/r?
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