How Do I Calculate Coulomb's Law for Fractional Electrical Charges?

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Discussion Overview

The discussion revolves around the application of Coulomb's Law, specifically regarding the calculation of forces between fractional electrical charges. Participants explore how to incorporate fractional values into the formula, addressing both theoretical and practical aspects of the law.

Discussion Character

  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant asks whether to use the fractional charge of +2/3 directly in the formula for Coulomb's Law.
  • Another participant seeks clarification on whether they are calculating the force between two charges of +2e/3.
  • A participant inquires about the units of charge and the value of e in those units, specifically questioning how to express 2/3e.
  • One participant confirms that if both charges are +2/3 C, they can simply plug in the charges into the formula.
  • A calculation is presented showing how to apply the values in Coulomb's Law, including the use of the constant K and the squared fraction.

Areas of Agreement / Disagreement

The discussion remains unresolved regarding the specifics of using fractional charges in Coulomb's Law, with participants expressing different levels of understanding and seeking clarification on various aspects.

Contextual Notes

There are limitations regarding the understanding of units and the implications of using fractional charges, as well as the need for clarity on the value of e in the context of Coulomb's Law.

Who May Find This Useful

This discussion may be useful for students or individuals studying electrostatics, particularly those interested in the application of Coulomb's Law with non-integer charge values.

robertroman10
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The law I am talking about is F=K* (qa*qb / r2) I know the values of all but I have a question on the q's which represent the electrical charges...
If the charge is +2/3 do I plug in the fraction 2/3 in the q's spot? is this the numerical number I use? PLEASE HELP!
 
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robertroman10 said:
The law I am talking about is F=K* (qa*qb / r2) I know the values of all but I have a question on the q's which represent the electrical charges...
If the charge is +2/3 do I plug in the fraction 2/3 in the q's spot? is this the numerical number I use? PLEASE HELP!
Are you trying to find the coulomb force between two charges of +2e/3?

AM
 
Yess
 
OK, so what unit is charge measured in? How much is e in those units? So how much then is 2/3e?
 
robertroman10 said:
The law I am talking about is F=K* (qa*qb / r2) I know the values of all but I have a question on the q's which represent the electrical charges...
If the charge is +2/3 do I plug in the fraction 2/3 in the q's spot? is this the numerical number I use? PLEASE HELP!

If both of the charges are +2/3 C, then you just plug in the charges for q

F = KQQ / R^2
F = (8.98e9)(2/3)^2 / R^2

The units for charge are Coulombs.
 
Last edited:
ok thanks
 

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