What is the Definition of Coulomb in Particle Physics and Electrodynamics?

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SUMMARY

The discussion clarifies that one coulomb (1 C) is equivalent to the charge of approximately 6.24 x 1018 electrons, where "charge" refers to the elementary charge of -1e associated with an electron. It emphasizes that while the elementary charge is defined as negative in particle physics, in electrodynamics, the coulomb is considered a positive quantity. This distinction is crucial for understanding the context in which charge is discussed, particularly in relation to Ampère's law and time.

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  • Understanding of elementary charge and its significance in particle physics
  • Familiarity with the definition and units of electric charge, specifically coulombs
  • Basic knowledge of Ampère's law and its relation to electric current
  • Concepts of positive and negative charge in electrodynamics
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Sam19KY
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When we say "1 coulomb is equal to charge on 6.24 x 10^18 electrons" does "charge" mean elementary charge or simply -1 ?
 
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##1C = 1As##, i.e. Coulomb is defined by Ampère and time. I think a unit of elementary charge is usually defined positive in Coulomb whereas an electron carries the charge ##-1e##. It's a matter of taste and how much is the author willing to confuse his readers.
In particle physics you have the charge of an electron as elementary charge ##-1##, in electrodynamics its ##C>0##.
 

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