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diff --git a/2102/CH3/EX3.12/exa_3_12.sce b/2102/CH3/EX3.12/exa_3_12.sce
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+// Exa 3.12
+clc;
+clear;
+close;
+// Given data
+Io= 1;// in micro amp
+Io=Io*10^-6;// in amp
+V_F= 0.52;// in V
+V_R= -0.52;// in V
+nita= 1;
+T=300;// in K
+V_T= T/11600;// in volt
+V_T=round(V_T*10^3);// in mV
+
+// (i)
+r_F= nita*V_T*10^-3/(Io*%e^(V_F/(nita*V_T*10^-3)));
+disp(r_F,"Dynamic resistance in the forward biased condition in ohm")
+
+// (ii)
+r_r= nita*V_T*10^-3/(Io*%e^(V_R/(nita*V_T*10^-3)));
+disp(r_r,"Dynamic resistance in the reverse biased condition in ohm")