Calculating Charge Magnitude for Nickel Coin Using Coulomb's Law

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Homework Help Overview

The discussion revolves around calculating the total charge of electrons in a nickel coin using Coulomb's Law and related concepts in electrostatics. The original poster presents a scenario involving the mass of the coin, the number of electrons, and the relationship between electrons and charge.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants explore the calculation of total charge based on the number of electrons and question how to relate this to Coulombs. There is a discussion about the number of electrons per atom and how that influences the total count of electrons in the coin.

Discussion Status

The discussion is ongoing, with participants providing insights and clarifications about the relationship between electrons and charge. Some guidance has been offered regarding the conversion of electrons to Coulombs, but there is no explicit consensus on the method to arrive at the final answer.

Contextual Notes

Participants note the importance of understanding the number of electrons per atom and the conversion factor for electrons to Coulombs. There is a mention of potential confusion regarding multiplication versus division in the context of calculating total charge.

tchounkovskii
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Homework Statement


A nickel coin has a mass of about 4.3g. Each mole (6.02e23 atoms) has a mass of about 58.2g


Homework Equations


I found the number of electrons on each coin, which is 1.245e24 and also the number of atoms on the coin which is 4.447e22.

The Attempt at a Solution


Now I have to find the magnitude of the charge of all of these electrons. I just started phys part two and need help. I Know that the C constant is, and I think I have to use the F=Q1Q2/r2but I can't come up with the solution
 
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Welcome to PF.

By C I think you mean the units of charge - Coulomb.

The formula you show is for the force between charges separated by a distance.

If you are looking for total charge in C, however, you will want to look up how many electrons makes up a Coulomb.
 
Well, I know that C=6.02 x 10^18 electrons, and I have 1.245 x 10^24 electrons, also the problem states that there are 28 electrons/atom on the nickel coin... would I multiply those?
 
tchounkovskii said:
Well, I know that C=6.02 x 10^18 electrons, and I have 1.245 x 10^24 electrons, also the problem states that there are 28 electrons/atom on the nickel coin... would I multiply those?

You might want to use 6.24*1018 electrons/ Coulomb.
http://en.wikipedia.org/wiki/Coulomb

As to the 28 per atom, didn't you use that already to determine total electrons?
 
yes, that was to find the total electrons
 
tchounkovskii said:
yes, that was to find the total electrons

So if you have total electrons and you know how many are in a Coulomb ...
 
I think i have to multiply but I'm not coming out with the right answer
 
tchounkovskii said:
I think i have to multiply but I'm not coming out with the right answer

If I have 48 eggs, and there are 12 eggs in a dozen, and I wanted to know how many dozen I had, ... I wouldn't be multiplying.
 
Ok, cool...got it thanks
 

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