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+//===========================================================================
+//chapter 11 example 4
+
+clc;
+clear all;
+
+//variable declaration
+R1    = 0.1;        //standard resistance in Ω
+V2    = 0.613;        //voltage drop across standard resistance in V
+a    = 100;    
+r    = 0.781;        //volt ration box
+theta    = 50.48;
+theta1    = 12.6;
+f        = 50;          //frequency in in HZ
+
+//calculations
+I    = V2/R1;        //current through coil in A
+V1    = a*r;        //voltage drop across inductive coil in V
+theta2 = theta -theta1;
+L    = V1*sin(theta2*180/%pi)/(2*%pi*f*I);    //inducatance of coil in H
+
+//result
+mprintf("inductance of coil =%3.2f H",L);