ass2: Add beautiful vortex cylinder drawing for 7

superconductivity_assignment2_kvkempen.tex

@@ -207,6 +207,19 @@ I might reread it some times.
 \end{em}
 
 \section{Currents inside type-II superconducting cylinder}
+For $B_{c1} < B_E < B_{c2}$, the cylinder of type-II superconductor material is in the mixed state.
+In the mixed or vortex state, superconductors let through a number of finite flux quanta $\Phi_0$.
+Some small regions of the material are not superconducting, but in the normal state.
+Flux passes through these regions in multiples of $\Phi_0$, but usually just one $\Phi_0$ per region,
+and a supercurrent is generated to expel the field from the rest of the material.
+This supercurrent moves around these region in a vortex-like shape.
+
+Please see the figure below for a beautiful drawing.
+
+\begin{figure}
+	\centering
+	\includegraphics[width=.8\textwidth]{cylinder-vortex-state.png}
+\end{figure}
 
 \bibliographystyle{vancouver}
 \bibliography{references.bib}