Update textbook.en.md

10.brainstorming-innovative-courses/intercambio-curso-electromagnetismo/textbook.en.md

@@ -693,7 +693,7 @@ $`\displaystyle\oiint_S\vec{E}\cdot\vec{dS}=\dfrac{Q_{int}}{\epsilon_0}`$$`=\dfr
 $`\displaystyle\oiint_S\vec{E}\cdot\vec{dS}=0`$
 
 
-$`\displaystyle\iiint_{\tau} div\vec{E} \cdot d\tau= \iiint_{\tau} \dfrac{\rho}{\epsilon_0} \cdot d\tau = \dfrac{1}{\epsilon_0} \cdot \iiint_{\tau} \rho \cdot d\tau = \dfrac{Q_{int}}{\epsilon_0} `$
+$`\displaystyle\iiint_{\tau} div\vec{E} \cdot d\tau= \displaystyle\iiint_{\tau} \dfrac{\rho}{\epsilon_0} \cdot d\tau = \dfrac{1}{\epsilon_0} \cdot \iiint_{\tau} \rho \cdot d\tau = \dfrac{Q_{int}}{\epsilon_0} `$