Calculating Net Force from Charges

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SUMMARY

To calculate the net force between multiple charges, use Coulomb's Law, represented as F=KQ1Q2/r², for two charges. For scenarios involving more than two charges, determine the force between each pair of charges and then sum these forces using the formula Fnet=F1+F2. This method ensures accurate calculation of the resultant force acting on a charge due to multiple interactions.

PREREQUISITES
  • Coulomb's Law (F=KQ1Q2/r²)
  • Understanding of electric charge interactions
  • Basic algebra for summing forces
  • Knowledge of vector addition for resultant forces
NEXT STEPS
  • Study the principles of vector addition in physics
  • Learn about electric field concepts and their relation to force
  • Explore examples of multiple charge systems in electrostatics
  • Investigate the implications of charge polarity on force calculations
USEFUL FOR

Students in physics, educators teaching electrostatics, and anyone interested in understanding the interactions between electric charges and calculating net forces in various scenarios.

Gardalay
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If I have two different charges and I'm told to calculate net force, do I just use F=KQ1Q2/r^2 or Fnet=F1+F2...
Please explain.
 
Last edited:
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Gardalay said:
If I have two different charges and I'm told to calculate net force, do I just use F=KQ1Q2/r^2 or Fnet=F1+F2...
Please explain.

If you have two charges at a distance 'r' then it is just F=KQ1Q2/r2


If you have more than two charges, you'd need to find the force between each pair of charges and then find the resultant force using Fnet=F1+F2
 
Ahh ok thanks
 

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