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//===========================================================================
//chapter 11 example 1
clc;clear all;
//variable declartion
v = 1.0186; //emf of standard cell in volts
l = 60; //length in cm
l1 = 75; //length in cm
l2 = 66; //length in cm
l3 = 84; //length in cm
l4 = 40; //length in cm
l5 = 72; //length in cm
S = 2; //resistance in Ω
r = 100; //ratio of volt ratio box
S1 = 2.5; //resistance in Ω
I = 0.28; //ammeter reading in ampere
v1 =1.25; //voltmeter reading in volts
//calculations
v0 = v/l; //the voltage drop per cm length of potentiometer wire in volt
V1 = v0*l1; //emf of cell which balances at 75 cm in volts
V2 = v0*l2; //emf of cell which balances at 66 cm in volts
I1 = v/S; //current flowing through 2 Ω resistance in A
V3 = v0*l3; //emf of cell which balances at 84 cm in volts
v31 = V3*r; //voltage of supply main in volts
V4 = v0*l4; //emf of cell which balances at 40 cm in volts
I4 =V4/S1; //current flowing through 2.5 Ω resistance in A
e = ((I-I4)/I4)*100; //percentage error in the ammeter reading in %
V5 = v0*l5; //emf of cell which balances at 72 cm in volts
e1 = ((v1-V5)/V5)*100; //percentage error in the voltmeter reading in %
//result
mprintf("emf of cell which balances at 75 cm = %3.5f volts",V1);
mprintf("\ncurrent flowing through 2 Ω resistance = %3.5f A",I1);
mprintf("\nvoltage of supply main in volts = %3.5f volts",v31);
mprintf("\npercentage error in the ammeter reading = %3.1d percentage high",e);
mprintf("\npercentage error in the voltmeter reading = %3.2f percentage ",e1);
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