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+// Dynamic resistance at forward bias
+// Basic Electronics
+// By Debashis De
+// First Edition, 2010
+// Dorling Kindersley Pvt. Ltd. India
+// Example 2-27 in page 103
+
+clear; clc; close;
+
+// Given data
+k_BT=25.86*10^-3; // Constant
+I_0=1.5*10^-6; // Current in microA
+V=0.15; // Forward bias voltage in volts
+V_T=0.02586; // Thermal voltage in volts
+
+// Calculation
+R_ac=k_BT/(I_0*exp(V/V_T));
+
+printf("Dynamic resistance = %0.2f W",R_ac);
+
+// Result
+// Dynamic resistance at forward bias = 52.17 W
+\ No newline at end of file