Difference between revisions of "Coulomb law"

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(Created page with "Coulomb law is fundamental scientific concept about interaction of electric charges. The special conserving quantity is postulated, called electric charge. Potential ene...")
 
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8.9875517873681764\times 10^9 \mathrm{Newton\, Meter^2\,  Coulomb}^{-2}
 
8.9875517873681764\times 10^9 \mathrm{Newton\, Meter^2\,  Coulomb}^{-2}
 
$
 
$
 +
==Do physicians know physics?==
  
 +
Since century 20, the popular questions for students of medical institutes was:
 +
<b>How many physicians know physics?</b>
 +
 +
The similar question refer to [[Matehmatica]] about the example below:
 +
 +
Needs["PhysicalConstants`"]
 +
VacuumPermittivity
 +
N[VacuumPermittivity]
 +
ElectronCharge
 +
ElectronCharge^2/(4 Pi VacuumPermittivity  )
 +
 +
The last line produces output
 +
 +
$\mathrm{
 +
(2.30708\times 10^{-28} Coulomb^2~ Meter~ Volt)/(Ampere~ Second)
 +
}$
  
 
==References==
 
==References==
 
https://en.wikipedia.org/wiki/Coulomb%27s_law
 
https://en.wikipedia.org/wiki/Coulomb%27s_law

Revision as of 11:05, 12 June 2016

Coulomb law is fundamental scientific concept about interaction of electric charges.

The special conserving quantity is postulated, called electric charge.

Potential energy of interaction of two charges $q_1$ and $d_2$ localised in regions small compared to the distance $r$ between them, is postulated to be

$\displaystyle U=k \frac{q_1 q_2}{r}$

where $k$ is fundamental constant determined by unit of measurement of the electric charge.

In the system SI, unit of charge is Coulomb, and

$\displaystyle k=\frac{1}{4 \pi \varepsilon_0} \approx 8.9875517873681764\times 10^9 \mathrm{Newton\, Meter^2\, Coulomb}^{-2} $

Do physicians know physics?

Since century 20, the popular questions for students of medical institutes was: How many physicians know physics?

The similar question refer to Matehmatica about the example below:

Needs["PhysicalConstants`"]
VacuumPermittivity
N[VacuumPermittivity]
ElectronCharge
ElectronCharge^2/(4 Pi VacuumPermittivity  )

The last line produces output

$\mathrm{ (2.30708\times 10^{-28} Coulomb^2~ Meter~ Volt)/(Ampere~ Second) }$

References

https://en.wikipedia.org/wiki/Coulomb%27s_law