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+//Caption:Calculate (i)-critical voltage ,(ii)-breakdown voltage, (iii)-breakdown electric field
+//Exa:9.4
+clc;
+clear;
+close;
+E_s=12.5;
+E_o=8.85*10^-12;
+E=E_o*E_s;
+N=3.2*10^22;//per cubic meter
+L=8*10^-6;//in m
+q=1.6*10^-19;//in coulombs
+V_c=q*N*L^2/(2*E);
+V_bd=2*V_c;
+E_bd=V_bd/L;
+disp(V_c/10^3,'Critical voltage(in kV) =');
+disp(V_bd/10^3,'Breakdown Voltage (in kV) =');
+disp(E_bd,'Breakdown Electric field (in V/cm) =');
+\ No newline at end of file