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diff --git a/2102/CH1/EX1.20/exa_1_20.sce b/2102/CH1/EX1.20/exa_1_20.sce
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+// Exa 1.20
+clc;
+clear;
+close;
+// Given data
+e= 1.6*10^-19;// in C
+I=100;// in A
+n_o= 8.5*10^28;// in m^-3
+A=10^-5;// in m^2
+// Formula I= n_o*A*e*Vd
+Vd= I/(n_o*e*A);// in ms^-1
+disp(Vd,"The drift velocity of free electron in ms^-1 is : ")