What is the electric force acting on the charge at the origin?

  • Thread starter gotpink74
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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. Homework 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

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
Simon Bridge
Science Advisor
Homework Helper
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1,654
p16-38alt.gif


You have to show your working and your reasoning or we cannot help you.
The procedure is to work out the force vectors for each charge and add them.
(Hint: pythagoras)

270 degrees looks a bit odd to me. That would be pointing along the +y axis.
reality-check: q1 is repulsed by q2 and attracted to q3 so the force points down and to the right ... so the angle should be less than 90 degrees.

Your equations are more carefully written like this:
[tex]\vec{F}_{a,b}=\frac{kq_aq_b}{r_{b,a}^2}\hat{r}_{b,a}\qquad \vec{F}=q\vec{E}[/tex]
 
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