I need a little guidance in this problem...(adsbygoogle = window.adsbygoogle || []).push({});

Two point charges lie along the y-axis. A charge of q1=-9 mu*C is at y=6.0m, and a charge of q2=-8.0 mu*C is at y=-4.0 m. Locate the point (other than infinity) at which the total electric field is zero.

So,

I made the statement

E1y = -E2y

and

Ke (q1/(r-4)^2) = Ke (q2/(r+4)^2)

or

q1/(r-6)^2 = q2/(r+4)^2

But that makes it very hard to solve for r. Is that equation set up correctly? If so, what is the easiest way, algebraicly, to solve for r.

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# Homework Help: Electric Field Question

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