initial commit / add all books

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+// Exa 1.10

+clc;

+clear;

+close;

+format('v',10)

+// Given data

+rho_i = 0.47;// in ohm-m

+sigma_i = 1/rho_i;// in S/m

+miu_e = 0.39;// in m^2/V-s

+miu_h = 0.19;// in m^2/V-s

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

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

+n_i = sigma_i/( e*(miu_e+miu_h) );// in /m^3

+disp(n_i,"The density of electrons per m^3 is");

+E = 10^4;

+v_n = miu_e*E;// in m/s

+disp(v_n,"The drift velocity for electrons in m/s is");

+v_h = miu_h*E;// in m/s

+disp(v_h,"The drift velocity for holes in m/s is");