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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);
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