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M3P2
Courses
Commits
a9ea694e
Commit
a9ea694e
authored
Oct 20, 2023
by
Claude Meny
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Update cheatsheet.fr.md
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cheatsheet.fr.md
...es-stationary-electric-field/20.overview/cheatsheet.fr.md
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12.temporary_ins/10.electrostatics-vacuum/20.causes-stationary-electric-field/20.overview/cheatsheet.fr.md
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a9ea694e
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@@ -537,6 +537,7 @@ figure
! par tous les anneaux 'épais' qui composent le disque.
<br>
!
<br>
! $
`E_z = \dfrac{\dens^{1D}}{2\epsilon_0}\cdot\dfrac{R\,z}{(R^2+z^2)^{\,3/2}}`
$
<br>
!
<br>
! devient
<br>
! $
`dE_z = \dfrac{\dens^{2D}}{2\epsilon_0}\cdot\dfrac{\rho\,z}{(\rho^2+z^2)^{\,3/2}}\,d\rho`
$
<br>
!
<br>
...
...
@@ -544,8 +545,8 @@ figure
!
<br>
! Calculons $
`E_z`
$ :
<br>
!
<br>
! $
`\scriptsize{\text{La dérivée de } u^n \text{ (avec u fonction de variable réelle x)
étant } u'\cdot u^{n-1}}`
$
! $
`\scriptsize{\text{alors,}}`
$
! $
`\scriptsize{\text{La dérivée de } u^n \text{ (avec u fonction de variable réelle x)
`
$
! $
`\scriptsize{\text{
étant } u'\cdot u^{n-1}\;\text{
alors,}}`
$
! $
`\scriptsize{\text{la primitive de } u'\cdot u^{n-1} \text{ est } u^n}`
$
! $
`\scriptsize{\text{soit encore }}`
$
! $
`\scriptsize{\text{la primitive de } u'\cdot u^n \text{ est } \dfrac{1}{n+1}\,u^{n+1}}`
$
...
...
@@ -555,9 +556,9 @@ figure
! $
`\displaystyle \hspace{1cm} = \dfrac{\dens^{2D}\,z}{2\epsilon_0} \int_{\rho = 0}^R\dfrac{1}{2}\,2\rho\,(\rho^2+z^2)^{-\,3/2}\,d\rho`
$
<br>
!
<br>
! $
`\displaystyle \hspace{1cm} = \dfrac{\dens^{2D}\,z}{2\epsilon_0} \big[\underbrace{\dfrac{1}{2}\,\dfrac{1}{-3/2+1}}
! _{=\
dfrac{1}{2}\times (-2) =
-1}(\rho^2+z^2)^{-\,1/2}\big]_{\rho = 0}^R`
$
<br>
! _{=\
frac{1}{2}\,\times \,(-2) \,=\,
-1}(\rho^2+z^2)^{-\,1/2}\big]_{\rho = 0}^R`
$
<br>
!
<br>
! $
`\displaystyle \hspace{1cm} = \dfrac{\dens^{2D}\,z}{4\epsilon_0} \
Big(\dfrac{1}{|z| - \dfrac{1}{\sqrt{\rho^2+z^2}}}\Big
)`
$
<br>
! $
`\displaystyle \hspace{1cm} = \dfrac{\dens^{2D}\,z}{4\epsilon_0} \
left(\dfrac{1}{|z|} - \dfrac{1}{\sqrt{\rho^2+z^2}}\right
)`
$
<br>
!
!
</details>
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