http://wpscms.pearsoncmg.com/wps/media/objects/4409/4515372/ebook/jfk1.html?

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bgh

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What are the magnitude and direction of the electric field at the dot in the figure?

If you follow link, Page 717 Problem 22 shows the figure...

I'm completely lost on how to even begin this problem. Any hints or points in the right direction would be sooo appreciated!! Thanks :)

I know that E=F/q=kq/r^2 but im really stuck, I dont even really understand what the figure is explaining.
 
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