1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Work required to move particles

  1. Jun 19, 2011 #1
    1. The problem statement, all variables and given/known data

    "Three particles with charges q1 = +10 µC, q2 = -20 µC, and q3 = +35 µC are positioned at the vertices of an isosceles triangle as shown in the figure. a = 12 cm and b = 6.0 cm.

    (a) How much work must an external agent do to exchange the positions of q1 and q3?

    (b) How much work must an external agent do to exchange the positions of q1 and q2, instead?"

    Figure: http://imageshack.us/photo/my-images/641/webassign.jpg/

    2. Relevant equations

    W=(kq1q2)/r

    3. The attempt at a solution

    I know (or think) that you have to sum up the work required. I know how to do this when the problem says that the particles are taken from infinity to some given position, but I don't know how to calculate the work required to move them from the given position in the figure to the new arrangement.
     
  2. jcsd
  3. Jun 21, 2011 #2

    ehild

    User Avatar
    Homework Helper
    Gold Member

    Calculate the change of the potential energy of the system: it is equal to the work done by the external agent.

    ehild
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Work required to move particles
Loading...