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Electric force angles problem

by Bensky
Tags: angles, electric, force
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Bensky
#1
Mar30-08, 10:23 AM
P: 82
1. The problem statement, all variables and given/known data
Three positive particles of charges 11.0 ÁC are located at the corners of an equilateral triangle of side d = 14.0 cm (Fig. 16-38). Calculate the magnitude and direction of the net force on each particle.

Fig. 16-38

2. Relevant equations
F = KQ_1Q_2/r^2


3. The attempt at a solution
F = KQ_1Q_2/r^2
F = (9X10^9)(1.1X10^-5)^2/.14^2
F = 55.561 N for all points - Q1, Q2, and Q3 (correct)

Q1 angle = 90 degrees (correct)
Q2 angle = ?
Q3 angle = ?

I need to find the directional angle for particles Q2 and Q3 - I am unsure how to find these. I was thinking I might have to draw a triangle?

Thanks,
Bensky
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rocomath
#2
Mar30-08, 10:24 AM
rocomath's Avatar
P: 1,755
It's an equilateral triangle.

[tex]\angle Q_1=\angle Q_2=\angle Q_3[/tex]

[tex]\angle Q_1+\angle Q_2+\angle Q_3=180[/tex]
Bensky
#3
Mar30-08, 10:39 AM
P: 82
Quote Quote by rocomath View Post
It's an equilateral triangle.

[tex]\angle Q_1=\angle Q_2=\angle Q_3[/tex]

[tex]\angle Q_1+\angle Q_2+\angle Q_3=180[/tex]
I'm not looking for the interior angles, I'm looking for the angle of direction of force on Q2 and Q3.


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