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+//Ex2.7.1
+//reverse saturation current =?
+clc;
+clear;
+If=10*10^-3;
+Vf=0.75;
+T=27;//temp in celsius
+T=T+273;//temp in kelvin
+n=2;//n is emission coefficient for si =2
+k=8.62*10^-5;// boltzmann's constant
+Vt=T*k;//voltage equivalent at given T
+Io=If/(%e^(Vf/(n*Vt))-1);
+disp( 'nA',Io*10^9,'reverse saturation current is :')