diff --git a/04_potentiel_electrique.md b/04_potentiel_electrique.md
index 54076f039d08daa5bc90b1f574a695541be14c95..a113fb72ecb34cea731a564d02a75b13a5c53d78 100644
--- a/04_potentiel_electrique.md
+++ b/04_potentiel_electrique.md
@@ -142,4 +142,34 @@ autres potentiels sont donnés par rapport à cette référence.
 
 ---
 
+---
+
+Question (Charge négative) #
+
+Reprenons un exemple similaire à @fig:epot, mais remplaçons la charge par une charge négative (voir @fig:epot_neg). Aussi elle se trouve au point $B$ et est libre de se déplacer.
+Que va-t-il se produire? Son énergie potentielle va augmenter ou diminuer? Comment le potentiel électrique varie entre les deux points $A$ et $B$?
+
+---
+
+---
+
+Réponse (Charge négative) #
+
+Une charge négative va être repoussée par la plaque négative et attirée par la charge positive. Ainsi, $q$ va se déplacer vers la plaque positive, son énergie cinétique va augmenter.
+A cause du principe de la conservation de l'énergie,
+son énergie potentielle va donc décroître. On a que
+$$
+E_\mathrm{pot}(A) < E_\mathrm{pot}(B).
+$$
+En revanche la charge se déplace d'une d'une région avec
+un potentiel élevé vers un potentiel plus faible. La variation
+de potentiel électrique (qui est dûe aux plaques) est donc positive contrairement à l'énergie 
+potentielle électrique
+\begin{align}
+&E_\mathrm{pot}(B)-E_\mathrm{pot}(A) > 0,\\
+&V(B)-V(A) > 0.
+\end{align}
+Si la charge $q$ était positive, la variation
+d'énergie potentielle
 
+---
diff --git a/figs/epot_neg.svg b/figs/epot_neg.svg
new file mode 100644
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+++ b/figs/epot_neg.svg
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