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Homework Help: Net Electric Field

  1. Nov 19, 2006 #1
    Find the magnitude and direction of the net electric field at the centre (or centroid) of the triangle.

    The triangle is equilateral and the point of reference is in the middle of the triangle.

    What I want to know is what equation do I use to figure this out?

    At first I thought it was: Fnet = kq1q2/r^2

    Is that right?, if not can you tell what to use?
  2. jcsd
  3. Nov 19, 2006 #2
    That's almost right...the question asks for the net electric field, which means you have to use a vector, not just the magnitude as you've shown.

    [tex]\vec{E} = \frac{kq}{r^2}\hat{r}[/tex]
  4. Nov 19, 2006 #3
    Also, how do I find the direction of the field?

    Do I have to use some sort of x and y component breakdown?
  5. Nov 19, 2006 #4
    That's right.
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