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`        A high resistance voltmeter is connected to a dry cell battery. The  voltmeter reads 10 volts. When a 20 ohm resistor is connected across the  terminals of the battery the voltmeter reading becomes 8 volts. What is  the internal resistance of the battery?`
6 years ago

419 Points
```										Dear Vidisha
If voltmeter resistance is high then it practically no current through it.
in first case it shows the emf, E of the cell
E=10 volts
in second case I=E/R+r  , R=20 and r is internal resistance
E-Ir=8
E-Er/(R+r) = 8
put value of E=10 and R=20
10 - 10r/20+r = 8
solving we get r=5 ohm

All the best.
AKASH GOYAL

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6 years ago
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