diff --git a/module-web/content/electromag/synthese.md b/module-web/content/electromag/synthese.md
index b1b3b8126782baad372a7caa360065563a3788d5..c7d5a23c40c72c30a04cf132ab5792ada4572747 100644
--- a/module-web/content/electromag/synthese.md
+++ b/module-web/content/electromag/synthese.md
@@ -354,7 +354,7 @@ end
 --- 
 
 
-## Ex. 4. : Câble coaxial  
+## Ex. 5. : Câble coaxial  
 
 On considère un câble coaxial portant un courant $I$ tel que représenté sur la figure ci-dessous.