How to calculate net force

  • #1
12
2

Homework Statement


Calculate the net force on A.[/B]
upload_2016-5-20_20-4-1.png

Homework Equations


F=k . (q1 q2)/r^2 , k=9 x 10^9 Nm^2/C^2[/B]


The Attempt at a Solution


(9*10^9 Nm^2/C^2)(1,4 x 10^-6C)(7,2 x 10^-6C) / 1,7mm^2
= 0,0313.
Could someone tell me what I am missing even if what i did is even correct.
Thanks
[/B]
 

Answers and Replies

  • #2
140
14
That’s NOT how you do it!
You add:
F(B)=k (qA qB)/(AB)^2 and F(C)=k (qA qC)/(AC)^2
As I said before, you ’superpose
’ (add) these 2 forces.
Do you understand now?
 
  • #3
140
14
Poster has been reminded not to do too much of the student's work for them...
F=(9*10^9 Nm^2/C^2)(1,6 x 10^-6C)(1,4 x 10^-6C) / 1,7mm^2+(9*10^9 Nm^2/C^2)(1,6 x 10^-6C)(7,2 x 10^-6C) / 3,4mm^2
 
  • #4
12
2
Yes! I understand now. Thanks once again. you've saved me. ;)
 

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