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+// Exa 5.10
+format('v',5);
+clc;
+clear;
+close;
+// Given data
+gm=50;
+R_E= 100;// in ohm
+R_S= 1;// in kohm
+R_S=R_S*10^3;// in ohm
+r_pi= 1100;// in ohm
+h_ie= r_pi;
+// Formula Av= Vo/Vs, But Vo= gm*vpi*R_E and Vs= Ib*(Ri+rpi), so
+Av= gm*R_E/(R_S+h_ie)
+// As Vo=Vf, so
+Bita=1;
+D= 1+Bita*Av;
+Avf= Av/D;
+Ri= R_S+r_pi;// in ohm
+Ri= Ri*10^-3;// in kohm
+R_if= Ri*D;// in kohm
+// Ro= infinite, so 
+// Rof= infinite
+disp(Av,"Value of Av is : ")
+disp(Bita,"Value of Bita is : ")
+disp(D,"The value of D is : ")
+disp(Avf,"Value of Avf is : ")
+disp(Ri,"Value of Ri in kohm")
+disp(R_if,"Value of R_if in kohm is : ")
+disp("Value of Ro and Rof is : ")
+disp("infinite")