# Force on particle: Coulomb

1. Sep 24, 2012

### Roodles01

1. The problem statement, all variables and given/known data
I have a simple question about forces on separated particles, but still need a bit of help. I have put down what I can:

3 particles;
A on y-axis @ √3, charge "q"
B & C each on x-axis, symmetrical about origin, separated by 2a, both charge "q".

Find magnitude & direction of force acting on A due to B & C.

2. Relevant equations
Coulombs law FAB[/SUB] = (q1 q2)/4∏ε0rAB rAB hat
All force should be attractive so
Resultant force on A should be 2x force from either A or B? Yes?
So should now become
FAB = (2 q2)/4∏ε0rAB rAB hat

r, from trig ratios, should be . . . . er . . . . √(a2+3) . . . . . feeling foolish here please help

Then F[/SUB] AB = 2q2 / ∏ε0√(a^2+3)

Last edited: Sep 24, 2012