initial commit / add all books

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diff --git a/2720/CH3/EX3.21.24/ex3_21_24.sce b/2720/CH3/EX3.21.24/ex3_21_24.sce
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+// Exa 3.21.24

+clc;

+clear;

+close;

+// Given data

+format('e',9)

+Mu_p = 500;// in cm^2/v-s

+kT = 0.0259;

+Toh_p = 10^-10;// in sec

+p_o = 10^17;// in cm^-3

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

+A=0.5;// in square meter

+del_p = 5 * 10^16;// in cm^-3

+n_i= 1.5*10^10;// in cm^-3    

+D_p = kT * Mu_p;// in cm/s

+L_p = sqrt(D_p * Toh_p);// in cm

+x = 10^-5;// in cm

+p = p_o+del_p* %e^(x/L_p);// in cm^-3

+// p= n_i*%e^(Eip)/kT where Eip=E_i-F_p

+Eip= log(p/n_i)*kT;// in eV

+Ecp= 1.1/2-Eip;// value of E_c-E_p in eV

+Ip= q*A*D_p/L_p*del_p*%e^(x/L_p);// in A

+disp(Ip,"The hole current in A is : ")

+Qp= q*A*del_p*L_p;// in C

+disp(Qp,"The value of Qp in C is : ")

+

+// Note: There is a calculation error to evalaute the value of hole current but they putted correct value of it to evaluate the value of Qp.

+//          Hence the value of hole current in the book is wrong