# Homework Help: What is the electric force acting on the charge at the origin?

1. Jan 23, 2012

### gotpink74

1. Consider three charges q1 = 4.3 nC, q2 = 6.6 nC, and q3 = -2.3 nC, arranged in a triangle as shown below.

(a) What is the electric force acting on the charge at the origin?
N, ° counterclockwise from the negative x-axis

(b) What is the net electric field at the position of the charge at the origin?
N/C, ° counterclockwise from the negative x-axi
picture of problem
http://www.webassign.net/holtphys/p16-38alt.gif

2. Relevant equations
F=kQ1Q2/r^2

3. The attempt at a solution
a) What is the electric force acting on the charge at the origin?
1.1739e-5 N, 270 ° counterclockwise from the negative x-axis

(b) What is the net electric field at the position of the charge at the origin?
4.3e12 N/C, 270 ° counterclockwise from the negative x-axis
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Jan 24, 2012

### Simon Bridge

$$\vec{F}_{a,b}=\frac{kq_aq_b}{r_{b,a}^2}\hat{r}_{b,a}\qquad \vec{F}=q\vec{E}$$