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+// Exa 3.31
+clc;
+clear;
+close;
+// Given data
+V_T= 0.025;// in V
+I_E= 0.5;// in mA
+I_E= I_E*10^-3;// in mA
+Rsig= 50;// in Ω
+R_C= 5*10^3;// in Ω
+re= V_T/I_E;// in ohm
+Rin= Rsig+re;// in ohm
+disp(Rin,"Input resistance in Ω is : ")
+// Part(b)
+// vo= -0.99*ie*R_C and ie= -v_sig/Rin
+vo_by_v_sig= 0.99*R_C/Rin;// in V/V
+disp(vo_by_v_sig,"The value of vo/vsig in V/V is : ")