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1. The problem statement, all variables and given/known data

Hi, I would appreciate it if someone could help me with this question, im a n00b here

Please and thank you

Okay heres the question.

The particles have charges Q1 = -Q2 = 100nC and Q3 = -Q4 =200nC

and distance a = 5.0cm.

What are the x and y components of the net electostatic force on particle 3 ?

So basically a diagram is given with the question showing the 4 particles equally seperated from each other at a distance of 5.0cm, making a square. And I have to find the force on particle 3.

2. Relevant equations

This is the equation I used.

F1,3 = (8.854x10^-12) x (Q1 x Q3)/0.0707xR^2 (0.0707 comes from Phyagrous therom)

H= (square root) 0.05^2 + 0.05^2

F1,4 = (8.854x10^-12) x (Q1 x Q4)/0.0707xR^2

Fnet = F1,3 + F1,4

= F1,3 + (8.854x10^-12) x (Q1 x Q3)/R^2 Cos 45 (45 degrees middle of square)

+ (8.854x10^-12) x (Q1 x Q4)/0.0707xR^2 Sin 45

3. The attempt at a solution

I have a feeling this is seriously wrong and have made it more complicated than it is.

I placed the values into the equation shown and came out with

= -79.46 x10^3 + 79.46 x10^3

Heres a site I found afterwards...

http://physics.bu.edu/~duffy/PY106/Charge.html

I think it might go a little something like that instead^^

If you could help that would be great thanks.

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# Homework Help: Coulomb's Law

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