Electric field, force on charge

AI Thread Summary
The discussion revolves around calculating the force on a charge q3 due to two other charges, q1 and q2, positioned at specific distances. The user initially struggles with the electric field calculations, particularly because the configuration is not a right triangle, complicating the use of the Pythagorean theorem. They utilize the formula for electric field strength, E = q/(4π * ε₀ * r²), to find E1 and E2 but encounter discrepancies in their results. After some back-and-forth, they confirm the correct value for E1 and successfully calculate E3, leading to the correct force value for q3. The conversation highlights the importance of accurate calculations in electrostatics and the challenges posed by non-right-angled configurations.
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Homework Statement



q1 = 10^-9 C
q2 =16*10^-9 C
Distance between q1 and q2 is 7*10^-3m
What force will affect a q3=2*10^-9 charge, which is 3*10^-3m from the q1 and 4*10^-3m from q2?

Homework Equations



So the triangle is not right angled which means i can't use the pitagorean theorem.
ok so i think i nede to use E=q/4*pi*electric const*r^2
And when i find the e3 i would use F=E3q3

The Attempt at a Solution



So i find the E1=10^7C/C and E2=0.9*10^7N/C then i get stuck at trying to get the E3

I also tried http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html multiple point charges got the e3 but when put into F=E3*q3 i get the 3.6*10-2 where the answer is 2*10^-3
 
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I think E1 should be 10^6 N/C .. what value of E3 you used?
 
lol it wasnt a triangle. i got it right now
 

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