initial commit / add all books

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+// Exa 3.21.5

+clc;

+clear;

+close;

+format('e',9)

+// Given data

+Mu_n = 0.15;// in m^2/v-s

+K = 1.38 * 10^-23; // in J/K

+T = 300;// in K

+del_n = 10^20;// in per m^3

+Toh_n = 10^-7;// in s

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

+D_n = Mu_n * ((K * T)/e);// in m^2/s

+disp(D_n,"The diffusion coefficient in m^2/s is");

+L_n = sqrt(D_n * Toh_n);// in m 

+disp(L_n,"The Diffusion length in m is");

+J_n = (e * D_n * del_n)/L_n;// in A/m^2

+disp(J_n,"The diffusion current density in A/m^2 is"); 

+// Note : The value of diffusion coefficient in the book is wrong.

+

+