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+// Exa 1.16

+

+clc;

+clear;

+

+// Given

+

+// Refer Fig.1.74

+Rmv = 200; // Voltmeter resistance in Ohms

+Vt = 3; // Terminal voltage(V)

+S = 1; // Sensitivity in mm/microV

+Rmi = 100; // Galvanometer resistance in Ohms

+Deflection = 250; // in mm

+S1 = 5; // sesitivity of second galvanometer in mm/micro Amp

+Ri = 1000; // Internal resistance of 2nd galvanometer

+// Solution

+

+Ig = Deflection/S;

+printf(' Current through the galvanometer = %d micro Amp \n',Ig);

+Rtotal = Rmv+Rmi;

+Vrtotal = Rtotal*Ig*10^-6; // in Volts

+Ek = Vt - Vrtotal;

+printf('The emf of the unknown source = %.3f V \n',Ek);

+printf('1 mm correspponds to 1 micro Amp. Therefore, Resolution = %d micro V/mm \n',Rtotal);

+

+printf('For galvanometer A, 1 mm deflection for 300 mV. So, Sa = 1/300 mm/microV \n');

+Sa = 1/300; // Sensitivity of galvanometer A in mm/micro V

+printf('For galvanometer B, - \n');

+Rbtotal = Ri+Rmv;

+// A 5mm deflcetion is caused by 1200 micro V

+printf('Sb = 5/1200  mm/microV \n'); // mm/microV

+printf('Galvanometer B provides the amplified sensitivity i.e, Since, Sb>Sa \n');