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diff --git a/2102/CH2/EX2.19/exa_2_19.sce b/2102/CH2/EX2.19/exa_2_19.sce
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+// Exa 2.19
+clc;
+clear;
+close;
+// Given data
+rho= 1.2;// in Ωm
+miu_n= 0.14;// in m^2/Vs
+q=1.6*10^-19;// in C
+ni= 1.8*10^16;// per m^3
+// sigma = 1/rho = q*n*miu_n
+n= 1/(rho*q*miu_n);// per m^3
+p= ni^2/n;// per m^3
+disp(n,"The value of n in per m^3 is :")
+disp(p,"The value of p in per m^3 is :")