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diff --git a/2102/CH1/EX1.5/exa_1_5.sce b/2102/CH1/EX1.5/exa_1_5.sce
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+// Exa 1.5
+clc;
+clear;
+close;
+// Given data
+format('v',13)
+e= 1.6*10^-19;// in C
+ni= 1.5*10^16;
+miu_n= 0.13;
+miu_p= 0.05;
+atomicDensity= 5*10^28;//atomic density of Si in /m^3
+C= 1/(2*10^8);// concentration  
+N_D= atomicDensity*C;// in /m^3
+n=N_D;
+p= ni^2/N_D;// in /m^3
+sigma= e*(n*miu_n+p*miu_p);// in s/m
+disp(sigma,"Conductivity of the extrinsic semiconductor in s/m is : ")
+