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diff --git a/3515/CH4/EX4.1/Ex_4_1.sce b/3515/CH4/EX4.1/Ex_4_1.sce
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+// Exa 4.1
+format('v',7);
+clc;
+clear;
+close;
+// Given data
+V_CC= 10;// in volt
+V_EE= -10;// in volt
+I= 1;// in mA
+I=I*10^-3;// in A
+R_C= 10;// in kohm
+R_C=R_C*10^3;// in kohm
+V_BE=0.7;// in volt
+
+i_C1= I/2;// in A
+i_C2= i_C1;// in A
+disp(i_C1*10^3,"Value of i_C1 in mA is : ")
+
+V_C1= V_CC-i_C1*R_C;// in V
+// For V_cm=0 volt
+V_E= -0.7;// in volt
+V_CE1= V_C1-V_E;// in volt
+disp(V_CE1,"For V_cm =0 , The alue of V_CE1 in volt is ")
+
+// For V_cm= -5 volt
+V_cm= -5;// in V
+V_B= V_cm;// in V
+// From V_BE= V_B-V_E
+V_E= V_B-V_BE;// in volt
+V_CE1= V_C1-V_E;// in volt
+disp(V_CE1,"For V_cm =-5V , The alue of V_CE1 in volt is ")
+
+// For V_cm= 5 volt
+V_cm= 5;// in V
+V_B= V_cm;// in V
+V_E= V_B-V_BE;// in volt
+V_CE1= V_C1-V_E;// in volt
+disp(V_CE1,"For V_cm =5V , The alue of V_CE1 in volt is ")