kontejnjer
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Homework Statement
Hello forums! I'd like to ask you for your assistance on this particular problem:
Three charges are placed at the edges of a triangle (Q1=+2 C, Q2=-4 C, Q3=+3 C) as shown on the picture (b=10 cm). What is the resultant force on charge Q2 (neglecting gravity and assuming the charges are in a vacuum)?
Homework Equations
F=k*Q1*Q2/r^2
k=9*10^9 N m^2 C^-2
The Attempt at a Solution
The distance "a" is given by:
tan 30°=a/b
Which gives: a=5.7735 cm.
Using the Pythagorean theorem I got: c=11.547 cm.
Then I calculated the force between Q1 and Q2 to be: F1=-2.16*10^13 N
Then I calculated the force between Q3 and Q2 and got: F2=-8.1*10^12 N
The problem I'm having is calculating the resultant force (Fr) on Q2. Which sort of formula should I use to calculate it?
I made a force diagram as well: