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Homework Help: Electric fields by point charges

  1. Jan 26, 2010 #1
    1. The problem statement, all variables and given/known data

    *ignore the given numbers in the image, mine is different*

    My numbers are:
    Q1: 1nC
    Q2: 8nC
    Q3: -6nC

    2. Relevant equations

    E = \frac{kq}{r^2} * \hat{r}

    3. The attempt at a solution
    I only did (a1) so far. I know (a2) involves the exact same process (find r and plug it into the formula), except I don't know how to express it in coordinates since they're not on the same axes.

    r = <? , ? , ?>
    If i know r I think I could solve the problem.

  2. jcsd
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