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+//=============================================================
+//Chapter 5 example 6
+
+clc;clear all;
+
+//variable declaration
+R = 50; //resistance of the magnetic coil in Ω
+Rt = 500; //resistance in Ω
+L = 0.09; //inductance of the voltmeter in H
+f = 50;
+I = 1;
+
+
+//calculations
+r = Rt-R; //swamping resistance in Ω
+X = (2*%pi*f*r)^2;
+Y = L*x;
+Y1 = I*L;
+//L = C*r^2/(I+w^2*C^2*r^2)
+//C*r^2 = L*I+L*w^2*C^2*r^2
+//C*r^2 =y1+x*(C^2)
+//x*(C^2)-C*r^2+y1;
+a = X;
+b = -r^2;
+c = Y1;
+x = (-b-sqrt((b^2)-(4*a*c)))/(2*a); //we consider the positive value
+
+
+
+//result
+mprintf("swamping resistance = %3.2e",x);
+
+
+