How Do You Calculate the Net Force in Physics Problems?

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Homework Help Overview

The discussion revolves around calculating the net force on a charge in a physics problem, specifically using Coulomb's law. Participants are exploring how to correctly apply the formula for net force involving multiple charges.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to calculate the net force using a specific formula but questions the correctness of their approach. Other participants suggest a different method involving the superposition of forces from multiple charges, prompting further clarification on the process.

Discussion Status

Some participants have provided guidance on the correct approach to calculating net force by suggesting the addition of forces from different charges. There is an indication of understanding developing among participants, but no explicit consensus has been reached on the final method.

Contextual Notes

Participants are discussing the application of Coulomb's law and the need to consider multiple forces acting on a charge. There may be constraints related to the specific values and units used in the calculations.

Kofyebs
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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]
 
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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?
 
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
 
Yes! I understand now. Thanks once again. you've saved me. ;)
 

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