(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Three charges are arranged as shown in the figure.

Figure

(Attached Below Could not insert the image, wouldn't work for me)

Find the magnitude of the electrostatic force on the charge at the origin. Answer in units of nN. What is the angle theta betwen the electrostatic force on the charge at the origin and the positive axis. Answer in degrees between -180 and 180 degrees measured from the positive X-axis, with counterclockwise positive.

2. Relevant equations

Coulombs Constant= 8.98755X10^9 N m^2/C^2

F=k((q'q)/r^2)

3. The attempt at a solution

So what I did was I found the Electrostatic force of the center charge and that of the bottom charge using F=K((q'q)/r^2) and I found it to be -2.115x10^-9 C which comes to be -2.115nC and I used the same equation to solve for the electrostatic Force between the center charge and the charge to the right and that came out to be -7.800x10^-10 C which turns to be .78Nc. I thought the Superposition Principal said to find the electrostatic for exerted to the center is just adding both forces together which gave me -2.895nC however when I inputed it on my online hwk it says it to be incorrect. So am I missing something here? And I also have no clue how to find the angle, and my book shows no example of it so can I get some hints on it.

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# Homework Help: Electrostatic Force and Superposition Principal

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