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  4. A voltmeter can read up to V volt. When the series resistance used in the voltmeter is doubled, range of voltmeter is

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Q. A voltmeter can read up to $V$ volt. When the series resistance used in the voltmeter is doubled, range of voltmeter is

COMEDKCOMEDK 2010Moving Charges and Magnetism

Solution:

Reading of voltmeter
$V = l_g (G + R)$ ... (i)
If resistance $R$ is increased to $2R$, the reading of voltmeter,
$V' = l_g(G + 2R) = 2V - I_g G$ (Using (i))

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