initial commit / add all books

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diff --git a/1730/CH2/EX2.11/Exa2_11.sce b/1730/CH2/EX2.11/Exa2_11.sce
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+//Exa11

+clc;

+clear;

+close;

+//given data

+rho_i=2*10^-3; //in ohm-m  (there is miss printed in this line in the book)

+sigma_i=1/rho_i;

+miu_e=0.3;// in m^2/V-s

+miu_h=0.1;//  in m^2/V-s

+e=1.6*10^-19; // in C

+// Formula sigma_i=nita_i*e*(miu_e+miu_h)

+nita_i=sigma_i/(e*(miu_e+miu_h));

+disp("Carrier density is : "+string(nita_i)+" /m^3");