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Homework Help: Electric Potential - Again

  1. May 20, 2007 #1
    Two charges lie on the x axis +2q at the origin and -3q at x=5m. The point on the x axis where the electric potential has a zero value is??

    relevant equations-

    my solution-
    since electric potential is a scalar quantity i reasoned that when you add the potentials of both charges and equate that to zero i should be able to find where electric potential is zero. i drew out a diagram and my working out is -

    V= k(2q)/x + k(-3q)/5-x = 0

    rearranging 2kq(5-x)=3kqx

    the k and q cancel giving 10-2x=5 ===> solving gives x=2.0m.

    have i made any errors in my working or is it all good? thanks in advance :tongue:
  2. jcsd
  3. May 21, 2007 #2
    Yep - looks good.
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