Calculate Voltage or EMF from Charge difference

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Discussion Overview

The discussion revolves around calculating voltage or electromotive force (EMF) based on differences in charge at two locations. Participants explore the relationship between charge and voltage, specifically in the context of theoretical scenarios involving point charges and batteries.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant poses a question about calculating voltage or EMF from a difference in the number of electrons at two locations, specifically asking how to derive voltage from charge difference.
  • Another participant suggests that Coulomb's Law and Maxwell's equations may be relevant to the question, though it is unclear how they directly apply to calculating voltage from charge difference.
  • A participant clarifies that they are not interested in force or electric field calculations but rather in determining the voltage difference when given specific charge values in a battery scenario.
  • A later reply presents a formula, V=Q/C, indicating that voltage can be calculated using charge and capacitance, but does not elaborate on how this relates to the initial question about charge differences.

Areas of Agreement / Disagreement

Participants do not reach a consensus on how to calculate voltage or EMF from charge differences, and multiple approaches are suggested without clear resolution.

Contextual Notes

There is a lack of clarity regarding the assumptions needed to apply the suggested formulas and concepts, particularly in how they relate to the specific scenarios presented by participants.

arvindmer
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Hi,

I have a problem about EMF and/or Voltage.
Let their are 100 electron at a place A and 200 electron at place B. Now what will be the Voltage/EMF (Voltage or EMF difference)?

And How to calculate it ??

In other words "How can I calculate Voltage or EMF if I know only Charge difference" ?
 
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By using Coulomb's law, force between two point charge and electric field due to a point charge at a distance r can be calculated.

But my problem is somewhat different. I don't want force or electric field, but voltage difference.

My question is like this Let in a battery at one node 1 Coulomb charge and at other node their are 10 Coulomb charge. Now I want to calculate Voltage or EMF (difference).

How to do that ?
 
V=Q/C

V=volts

Q=coulombs

C=farads

Reference:Physics (second edition), by Hausmann and Slack.
page 450
 

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