A galvanometer (coil resistance 99 Ω ) is converted into an ammeter using a shunt of 1 Ω and connected as shown in figure
A
. The ammeter reads 3 A. The same galvanometer is converted into a voltmeter by connecting a resistance of 101 Ω in series. This voltmeter is connected as shows in figure Internal resistance r of the cell
B
. Its reading is found to be 4/5 of the full scale reading. Find- 
Range of the ammeter and voltmeter
Range of the ammeter and voltmeter
C
Full scale deflection current of the galvanometer
Text Solution
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Ans. For ammeter
is the full scale deflection current of the galvanometer and 
is the range of ammeter
For the circuit in the adjacent figure,
For voltmeter, range
….(2)
Also resistance of the voltmeter 
In the adjacent figure, resistance across the terminals of the battery
∴ Current drawn from the battery, 
∴ Voltmeter reading
Using Eq. (2), 
Using Eqs. (1), range of the ammeter
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