Update cheatsheet.fr.md

12.temporary_ins/20.magnetostatics-vacuum/10.effects-stationary-magnetic-field/20.overview/cheatsheet.fr.md

@@ -156,19 +156,7 @@ $`\dfrac{\partial \dens}{dt}=\dfrac{\partial \,(\dens_{liée} + \dens_{libre})}{
 $`\quad\quad\Longrightarrow \overrightarrow{dF_{mag}}= \dens_{libre} \cdot d\tau \cdot (\overrightarrow{v}_{dér\,/\,dC} \wedge \overrightarrow{B})`$.
 
 * On nomme **force de Laplace** cette *force magnétique $`\overrightarrow{dF_B}`$ exercée sur chaque élément $`dC`$* du circuit :   
-<br>
-$`\begin{align}\color{brown}{\mathbf{\overrightarrow{dF}_{Laplace}}}
-&= \dens_{libre} \cdot \underbrace{d\tau}_{\color{blue}{\;\;=\\dS\,dl}} 
-\cdot (\overrightarrow{v}_{dér\,/\,dC} \wedge \overrightarrow{B})\\
-\\
-&= \underbrace{(\dens_{libre}\cdot \overrightarrow{v}_{dér\,/\,dC}}_{\color{blue}{=\,\overrightarrow{j}_{cond}}}
-   \cdot \underbrace{dS}_{\color{blue}{\vec{dS}\parallel\vec{v}}}
-   \cdot \underbrace{dl}_{\color{blue}{\vec{dl}\parallel\vec{v}}}) \wedge \overrightarrow{B}\\
-\\
-&= \underbrace{\overrightarrow{j}_{cond}\cdot\overrightarrow{dS}}_{\color{blue}{=\,I}}\;\overrightarrow{dl}\wedge\overrightarrow{B}\\
-\\
-&\mathbf{\color{brown}{=I\,\overrightarrow{dl}\wedge\overrightarrow{B}}}
-\end{align}`$
+
 <br>
 $`\begin{align}\color{brown}{\mathbf{\large{\overrightarrow{dF}_{Laplace}}}}
 &= \dens_{libre} \cdot \underbrace{d\tau}_{\color{blue}{\;\;=\\dS\,dl}} 
@@ -183,11 +171,6 @@ $`\begin{align}\color{brown}{\mathbf{\large{\overrightarrow{dF}_{Laplace}}}}
 &\mathbf{\color{brown}{\large{=I\,\overrightarrow{dl}\wedge\overrightarrow{B}}}}
 \end{align}`$
 
-
-
-<br>
-**$`\mathbf{\large{\overrightarrow{dF}_{Laplace}=I\,\overrightarrow{dl}\wedge\overrightarrow{B}}}`$** 
-
 <br>
 
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