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Calculating Work

  1. Feb 18, 2012 #1
    1. The problem statement, all variables and given/known data

    Consider the three charges in the figure below with Q1 = 2.8 µC, Q2 = 4.4 µC, and Q3 = -3.7 µC. A fourth charge q = -4.8 µC is brought from very far away and placed at the origin.

    http://www.webassign.net/giocp1/18-p-009.gif

    How much work is required in this process?
    How much work is required to move q from the origin to a distance that is very far away?

    2. Relevant equations

    PE = -W = -F Δx = -qE Δx

    3. The attempt at a solution

    am i suppose to calculate the PE of each Q?
     
  2. jcsd
  3. Feb 19, 2012 #2

    ehild

    User Avatar
    Homework Helper
    Gold Member

    The work done on the charge q is equal to the change of its potential energy when it is moved from infinity to the origin.

    ehild
     
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