Electrostatic Force: Learn About Its Effects

[jayryap]

electrostatic force!

Homework Statement

http://img10.imageshack.us/img10/3914/picture0117.jpg

Homework Equations

The Attempt at a Solution

 

[dx]

Hi Jayryap,

Welcome to PF. Please show your attempt.

 

[jayryap]

please help me ... i don't know what to do next...

am i correct with my work?

thank you very much!

 

[dx]

I'm unable to read the pictures!

 

[jayryap]

a)the forces between q1 and q3
F = k * (q1 * q3/d13^2)
k = (1/4πεo) = 9 * 10^9 Nm^2/C^2 and d13= 20 cm = 20 * 10^-2 m
F=-1.125N
b)the force between charges q1 and q3 is
F1 = k * (q1 * q3/d13^2)
= -1.125N
the force between charges q1 and q2 is
F2 = k * (q1 * q2/d12^2)
=3.5N