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+//CHAPTER 2- STEADY-STATE ANALYSIS OF SINGLE-PHASE A.C. CIRCUIT
+//Example 11
+
+disp("CHAPTER 2");
+disp("EXAMPLE 11");
+
+//VARIABLE INITIALIZATION
+vdc=100;                      //DC voltage in Volts
+vac=100;                      //AC voltage in Volts
+f=50;                         //in Hertz
+Idc=10;                       //dc current in Amperes
+Iac=5;                        //ac current in Amperes
+
+// coil means a unit of resistence and inductance both
+//Impedence Z=R+jXl
+//when DC supply is connected to coil, it behaves like a short circuit
+//Xl=2.pi.f.L
+//since f=0 in DC, Xl=0 ohms
+//Therefore, R=Vdc/I
+
+//Equation to be used
+//Z^2=R^2+Xl^2
+
+//SOLUTION
+r=vdc/Idc;		//resistance of the coil in dc circuit
+z=vac/Iac;		//impedance of the coil in Ac supply
+xl=sqrt((z^2)-(r^2));	// inductive reactance of coil
+L=xl/(2*%pi*f);		//inductance of the coil 
+pf=r/z;			// power factor pf=R/Z
+//
+disp(sprintf("The inductive reactance of the coil is %5.2f Ohm",xl));
+disp(sprintf("The inductance of the coil is %4.2f H",L));//text book answer is 0.05 H
+disp(sprintf("The power factor of the coil is %3.1f (lagging)",pf));
+
+//END
+
+
+