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+//Exa3.6
+clc;
+clear;
+close;
+// given data
+n_i=2.5*10^13;// in cm^3
+e=1.6*10^-19;// in coulomb
+miu_h=1800;// in cm^2/V-s
+miu_e=3800;// in cm^2/V-s
+sigma_i=n_i*e*(miu_e+miu_h);
+disp("Intrinsic conductivity is : "+string(sigma_i)+" /ohm-cm");
+rho_i=1/sigma_i;
+disp("Intrinsic resistiviry is : "+string(rho_i)+" ohm-cm")