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+// Exa 2.39
+clc;
+clear;
+close;
+// Given data
+T=300;// in K
+n=1;
+V_T= 26;// in mV
+V_T=V_T*10^-3;// in V
+V_F= 200;// in mV
+V_F=V_F*10^-3;// in V
+Io= 1;// in µA
+Io= Io*10^-6;// in A
+r_F= n*V_T/(Io*%e^(V_F/(n*V_T)));// in Ω
+disp(r_F,"The ac resistance of a semiconductor diode in Ω")