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diff --git a/2288/CH2/EX2.20.3/ex2_20_3.sce b/2288/CH2/EX2.20.3/ex2_20_3.sce
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index 000000000..0dbe2403e
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+++ b/2288/CH2/EX2.20.3/ex2_20_3.sce
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+//Exa 2.20.3
+clc;
+clear;
+close;
+//Given data
+R = 9 * 10^-3;// in ohm-m
+R_H = 3.6 * 10^-4;// in m^3
+e = 1.6 * 10^-19;// in C
+Sigma = 1/R;// in (ohm-m)^-1
+Rho = 1/R_H;// in coulomb/m^3
+n = Rho/e;// in /m^3
+disp(n,"Density of charge carriers in per m^3 is");
+Mu = Sigma * R_H;// in m^2/v-s
+disp(Mu,"Mobility of charge carriers in m^2/V-s is");
+