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diff --git a/2102/CH2/EX2.1/exa_2_1.sce b/2102/CH2/EX2.1/exa_2_1.sce
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+// Exa 2.1
+clc;
+clear;
+close;
+// Given data
+miu= 0.3;// in m^2/vs
+V= 50;// in mV
+V=V*10^-3;// in V
+d=0.4;// in mm
+d=d*10^-3;// in m
+// Part (a)
+// miu= vd/E and vd= miu*E, so
+vd= miu*V/d;// in m/s
+disp(vd,"Drift velocity in m/s is : ")
+
+// Part (b)
+T= d/vd;// in sec
+disp(T*10^6,"Time required for an electron to move in µs is :")