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diff --git a/2102/CH2/EX2.31/exa_2_31.sce b/2102/CH2/EX2.31/exa_2_31.sce
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+// Exa 2.31
+clc;
+clear;
+close;
+// Given data
+format('v',13)
+rho= 0.5;// in Ω-m
+miu_c= 0.4;// in m^2/v-sec
+J=100;//in A/m^2
+distance=10;// µm
+distance=distance*10^-6;//in sec
+// V= miu_c*E = miu_c*J/sigma = miu_c*J*rho 
+V=  miu_c*J*rho ;// in m/sec
+disp(V,"Drift velocity in m/sec is : ")
+T= distance/V;// in second
+disp(T,"The time taken by the electron to travel 10 micro meter in the crystal in second is :  ")