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## Homework Statement

The sides of the triangular web have a length of a = 0.74 m, as depicted in the figure. Two of the spiders (S1 and S3) have +6.6 µC charge, while the other (S2) has −6.6 µC charge.

a.) What are the magnitude and direction of the net force on the third spider (S3)?

**I attached the image below because I don't know how to link it through here.**

## Homework Equations

[tex]|\boldsymbol{F}|=k_e{|q_1q_2|\over r^2}[/tex]

## The Attempt at a Solution

There is a force vector on S3 pointing away from the positive charge of S1 and there is another force vector pointing towards charge S2. I applied Coulomb's law for the force vector on S1 to S3 and I got the distance r = 0.74 but I can't find the angle. Will the angle just be [tex]\tan^{-1}(.37/.64)[/tex] so I will get:

[tex]|\boldsymbol{F}|=k_e{|(6.6\times 10^{-6})^2 |\over (0.74)^2}(\cos\theta I - \sin\theta j) [/tex]

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