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diff --git a/2702/CH3/EX3.19/Ex_3_19.sce b/2702/CH3/EX3.19/Ex_3_19.sce
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+// Exa 3.19
+clc;
+clear;
+close;
+// Given data 
+VBE= 0.7;// in V
+VT= 0.025;// in V
+I_B= 100;// in µA
+I_B=I_B*10^-6;// in A
+I_C= 10*10^-3;// in A
+// Formula I_C= I_S*%e^(VBE/VT)
+I_S= I_C/(%e^(VBE/VT));// in A
+alpha= I_C/(I_C+I_B);
+bita= I_C/I_B;
+IS_by_alpha= I_S/alpha;// in A
+IS_by_bita= I_S/bita;// in A
+disp(alpha,"The value of alpha is : ");
+disp(bita,"The value of bita is : ");
+disp(IS_by_alpha,"The value of Is/alpha in A is :");
+disp(IS_by_bita,"The value of Is/bita in A is : ");