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## Homework Statement

Two small spheres, each with mass m = 5.0 g and charge q, are suspended from a point by threads of length L = 0.30 m. What is the charge on each sphere if the threads make an angle θ = 20° with the vertical?

## Homework Equations

F=k|q

_{1}q

_{2}|/r

^{2}

## The Attempt at a Solution

I found the opposite side of one of the triangles to be around 0.10m (0.30mSin(20°)=opp). So the radius between the two charges would be 2 x opposite side length= 0.20m. Without knowing the force between the two charges, I'm at a loss as to how to find the charge on each sphere. I do have an idea: I find it strange to have two spheres floating without coming together due to gravity, so I'm guessing that for this to happen, the electric force may be equal to and in opposition to the gravitational force. Is this the right line of thinking?

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