A voltmeter has a resistance of 100 Ω. What will be its reading w… - Vidyadip

Question

A voltmeter has a resistance of 100 Ω. What will be its reading when it is connected across a cell of emf 2 V and internal resistance 20 Ω?

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Answer

Data: $E=2 V, r=20 \Omega, R=100 \Omega$
The voltmeter reading, $V= R$
$
V =\left(\frac{2}{100+20}\right) 100=\frac{200}{120}=\frac{10}{6}=1.667 V
$

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