initial commit / add all books

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+// Exa 3.21.18

+clc;

+clear;

+close;

+// Given data

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

+n_n = 5 * 10^20;// in /m^3

+n_n = n_n * 10^-6;// in cm^3

+Mu_n = 0.13;// in m^2/V-sec

+Mu_n = Mu_n * 10^4;// in cm^2/V-sec

+Sigma_n = q * n_n * Mu_n;// in (ohm-cm)^-1

+Rho = 1/Sigma_n;// in Ω-cm

+l = 0.1;// in cm

+A = 100;// µm^2

+A = A * 10^-8;// in cm^2

+R = Rho * (l/A);// in Ohm

+R=round(R*10^-6);// in MΩ

+disp(R,"The resistance of the bar in MΩ is");