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+// Exa 1.21
+clc;
+clear;
+close;
+// Given data
+miu_n= 0.13;// in m^2/v-sec
+lip= 0.05;// in m^2/v-sec
+n=5*10^28/10^9;// in /m^3
+q= 1.6*10^-19;// in C
+sigma= q*n*miu_n;// in (Ωm)^-1
+disp(sigma,"The conductivity of silicon material in (Ωm)^-1 is : ")