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Homework Help: Point charge / potential / work

  1. Sep 23, 2008 #1
    1. The problem statement, all variables and given/known data

    Two point charges q1 = +2.80 nC and q2 = -6.30 nC are 0.100 m apart. Point A is midway between them and point B is 0.080 m from q1 and 0.060 m from q2 (Fig. 23.29). Take the electric potential to be zero at infinity.

    ***Figure attached***

    (a) Find the potential at point A.

    (b) Find the potential at point B.

    (c) Find the work done by the electric field on a charge of 2.50 nC that travels from point B to point A.

    2. Relevant equations

    V= k summation( q/r) of each charge and radius
    w = q(delta v)

    3. The attempt at a solution

    when answering (a) and (b) i got -630 and -630 so by the second relevant equation the answer to (c) should be "0" but i got that answer wrong.

    what am i doing wrong

    Attached Files:

  2. jcsd
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