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//===========================================================================
//chapter 10 example 12
clc;clear all;
//variable declaration
P = 100; //resistance in arm AB in Ω
Q = 1000; //resistance in arm BC in Ω
S = 2000; //resistance in arm CD in Ω
R = 202; //resistance in arm BD in Ω
Rg = 200; //galvanometer resistance in Ω
E = 5; //voltage in V
Si = 5; //current sensitivity of the galavanometer in mm/uA
//calculations
Si1 = 5*10^9; //current sensitivity of the galavanometer in mm
R1 = (P*S)/Q; //resistance required in arm BD for balance bridge
dR = R-R1; //the deviation from balanced condition in Ω
Eth = E*(((R1+dR)/(R1+dR+S))-(P/(P+Q))); //thevenin's open circuit voltage in V
Rth = (((R1+dR)*S)/(R1+dR+S))+((P*Q)/(P+Q)); //thevenin's equivalent resistance of bridge in Ω
Ig = Eth/(Rth+Rg); //galvanometer current in A
d = Si1*Ig; //deflection of the galvanometre theta in mm
S = d/dR; //sensitivity of the bridge in mm/Ω
//result
mprintf("galvanometer current = %3.2e A",Ig);
mprintf("\ndeflection of the galvanometre theta = %3.1f mm",(d*10^-3));
mprintf("\nsensitivity of the bridge = %3.2f mm/Ω",(S*10^-3));
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