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+// Exa 3.11
+clc;
+clear;
+close;
+// Given data
+I_F= 70;// in mA
+V_F= 26;// in mV
+delta_I_F= 60;// in mA
+delta_I_F=delta_I_F*10^-3;// in A
+delta_V_F= 0.025;// in V
+r_d= delta_V_F/delta_I_F;// in ohm
+disp(r_d,"Dynamic resistance in ohm is : ")
+// and the stimated value of the dynamic resistance is
+r_d= V_F/I_F;// in ohm
+disp(r_d,"The stimated value of the Dynamic resistance in ohm is : ")