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Sep11-08, 02:13 PM
1. The problem statement, all variables and given/known data
Three charged particles form a triangle: particle 1 with charge Q1=80nC is at xy coordinates (0,3.00mm) particle 2 with charge q2 is at (0,-3.00mm) and particle 3 is at(4.00mm,0). In unit vector notation, what is the electrostatic force on particle 3 due to the other two particles if Q2 is equal to (a) 80.0 nC and (b) -80nC?
The book lists the answers as: (a).(0.829N)i and (b) (-.621N).
2. Relevant equations
k=permittivity constant 8.99x10^9
r= distance between the charges
3. The attempt at a solution
I have tried countless different ways to do it and can't seem to get the book's answer. I have played around with the numbers for over 3 hours and havent found anything that works. Any help would be GREATLY appreciated as I have no idea how close or far away I am.
The last way I tried it was by drawing out the triangle. I found theta to be arctan(3/4)=36.869degrees
I have no idea what the units are there after all that on the latest try, nor what that answer means.
Sep11-08, 03:15 PM
k = 8.99x10^9 -- Yes
r = (6x10^-3) -- No. You need the distance between q1 and q3, not between q1 and q2.
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