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+//===========================================================================
+//chapter 5 example 3
+clc;
+clear all;
+
+//variable declaration
+R    = 500;		//resistance in 
+r    = 2000;            //non inductive resistance in
+V   = 250;	     //voltage in V
+f     = 50;             //frequency in Hz
+L    = 1;           //inductance in H
+
+
+//calculations
+x       = (r+R)^2;
+W     = (2*%pi*f*L)^2;
+Z     =sqrt(x+W);		//impedance of the instrument circuit
+I    = V/(Z);			//current drawn by instrument in A
+I2   = V/(R+r);			//since voltmeter reads correctly on dc supply on 250 V,corresponding current in A
+V1   = V*(I/(I2));             //voltmeter reading when connected to 250V ,50Hz  supply
+
+//result
+mprintf("voltmeter reading = %3.1d V",V1);
+