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diff --git a/2102/CH1/EX1.4/exa_1_4.sce b/2102/CH1/EX1.4/exa_1_4.sce
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+// Exa 1.4
+clc;
+clear;
+close;
+// Given data
+format('v',13)
+ni= 2.5*10^19;
+q= 1.6*10^-19;// in C
+miu_n= 0.36;
+miu_p= 0.17;
+sigma= q*ni*(miu_n+miu_p);// in s/m
+rho= 1/sigma;// in Ωm
+disp(sigma,"The conductivity of Ge in s/m is ")
+disp(rho,"The resistivity of Ge in Ωm is : ")