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+// Exa 5.11

+format('v',7);clc;clear;close;

+// Given data

+R1 = 1000;// in ohm

+R2 = 100;// in ohm

+R3 = 4;// in k ohm

+R3 = R3*10^3;// in ohm

+//At bridge balance, R1*R3 = R2*R4;

+R4 = (R1*R3)/R2;// in ohm

+R4= R4*10^-3;//maximum unknown resistance in k ohm

+disp(R4,"The maximum unknown resistance in kΩ is");

+R4= R4*10^3;// in ohm

+R_TH = ((R1*R2)/(R1+R2)) + ((R3*R4)/(R3+R4));// in ohm

+Si = 70;// in mm/µA

+Si = Si * 10^6;// in mm/A

+theta = 3;// in mm

+E = 10;// in V

+Rg = 80;// in ohm

+// theta = (Si*E*R3*del_R)/((R_TH+Rg)*((R3+R4)^2));

+del_R = (theta*((R_TH+Rg)*((R3+R4)^2)))/(Si*E*R3);// in ohm

+disp(del_R,"The value of del_R in Ω is : ")

+disp("This much unbalance is necessary to cause the deflection of 3 mm")