initial commit / add all books

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diff --git a/1730/CH3/EX3.28/Exa3_28.sce b/1730/CH3/EX3.28/Exa3_28.sce
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+//Exa3.28

+clc;

+clear;

+close;

+// given data'

+format('v',13)

+N_D=10^17*10^6;// in m^-3

+N_A=0.5*10^16*10^6;// in atoms/m^3

+epsilon_r=10;// in F/m

+epsilon_o=8.85*10^-12;// in F/m

+epsilon=epsilon_r*epsilon_o;

+e=1.602*10^-19;// in C (electron charge)

+// (i) when no external voltage is applied i.e.

+V=0;

+V_B=0.7;// in V

+W=sqrt(2*epsilon*V_B/e*(1/N_A+1/N_D));

+disp("Junction width is : "+string(W)+" m");

+// (ii) when external voltage of -10 V is applied i.e.

+V=-10;// in V

+V_o=0.7;// in V

+V_B=V_o-V;

+W=sqrt(2*epsilon*V_B/e*(1/N_A+1/N_D));

+disp("Junction width is : "+string(W)+" m");

+

+// Note: Answer in the book is wrong