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diff --git a/2198/CH2/EX2.7.3/Ex2_7_3.sce b/2198/CH2/EX2.7.3/Ex2_7_3.sce
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+//Ex 2.7.3
+clc;clear;close;
+format('v',8);
+
+//Given : 
+Eta=2;//for Si diode
+T=300;//K
+VT=T/11600;//V
+IbyIo=90/100;
+//I=Io*(exp(V/Eta/VT)-1)
+V=log(IbyIo+1)*Eta*VT;//V
+disp(V*1000,"Saturation value of voltage in mV : ");
+VF=0.5;//volts
+VR=-0.5;//volts
+IFbyIR=(exp(VF/Eta/VT)-1)/(exp(VR/Eta/VT)-1);//ratio
+disp(IFbyIR,"Ratio of forward to reverse current : ");
+//Answer in the book is wrong.