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+// Exa 3.10
+format('v',6)
+clc;
+clear;
+close;
+// Given data
+Vz1= 10;//voltage across zener diode, Z1 in V
+Vz2= 5;// voltage across zener diode, Z2 in V
+Iz1= 30*10^-3;// current through zener diode, Z1 in A
+Iz2= 15*10^-3;// current through zener diode, Z1 in A
+I_knee= 5*10^-3;//knee current of zener diode,Z1 in A
+R_L=500;//load resistance in ohm
+R= 1*10^3;// in ohm
+V_B= 25;// in V
+// Current through RL,
+I_RL= Vz2/R_L;// in A
+// Current through R2,
+I_R2= Iz2+Vz2/R_L;// in A
+// Voltage across resistance R2,
+V_R2= Vz1-Vz2;// in V
+R2= V_R2/I_R2;// in ohm
+disp(R2,"The value of resistance R2 in ohm is : ")
+// Current through R1,
+I_R1= Iz1+Vz1/R+I_R2;//in A
+// Voltage across R1,
+V_R1= V_B-Vz1;// in V
+R1= V_R1/I_R1;// in ohm
+disp(R1,"The value of resistance R1 in ohm is : ")
+// Current through R1,
+I_R1= I_knee+Vz1/R+I_R2;// in mA
+// Voltage across R1,
+V_R1= I_R1*R1;// in volts
+V_Bmin= Vz1+V_R1;// in V
+disp(V_Bmin,"The lowest power supply voltage in volts is : ")