Electric force due to point charges

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Homework Statement


3 point charges are fixed in place in the right triangle shown below, in which q1= 0.67 microC and q2= -0.67 microC. What is the electric force on q3 with +1.0 microC due to the other two charges?
Magnitude?
direction, measured counterclockwise from the +x axis?

**HYP=10cm or .1m (q1-q3)
**Opp=8cm or .08m (q1-q2)


Homework Equations


[k (q1) (q1)]/d^2
k= 8.99e9

The Attempt at a Solution


f13= (8.99e9 * .67e-6 * 1e-6)/ .1^2 <-- shouldn't this provide the magnitude from q1 & q2 on q3?
 
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