From 1b2ecb376138a9b85eae3aa86731e53dcf22a6c9 Mon Sep 17 00:00:00 2001
From: "T. van der Sar" <t.vandersar@tudelft.nl>
Date: Mon, 21 Jan 2019 15:22:09 +0000
Subject: [PATCH] Update 3_drude_model.md - typo

---
 src/3_drude_model.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/3_drude_model.md b/src/3_drude_model.md
index 7ec9c669..ee00050f 100644
--- a/src/3_drude_model.md
+++ b/src/3_drude_model.md
@@ -89,12 +89,14 @@ While most materials have $R_{\rm H}>0$, interestingly some materials are found
 
 ### Exercise 1: Motion of an electron in a magnetic and an electric field.
 We first consider an electron in free space, moving in a plane perpendicular to a magnetic field ${\bf B}$ with velocity ${\bf v}$.
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   1. What is the shape of the motion of the electron? Calculate the characteristic frequency and time-period $T_c$ of this motion for $B=1$ Tesla.
   2. Formulate a differential equation for ${\bf v}$.
   3. Now we add an electric $E$ that is perpendicular to ${\bf B}$. Sketch the motion of the electron.
   4. Adjust the differential equation of found in (2) to include ${\bf E}$.
   
 We now consider an electron in a metal.
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   5. Drude theory assumes a scattering time $\tau$. Include this time into the differential equation for the velocity you formulated in 4.
   6. Let's assume $\tau \gg T_c$. What would the shape of the motion of the electron be in this limit? What would the shape be when $\tau \ll T_c$? Which of these two limits holds in a typical metal?
 
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