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Current Electricity — Physics STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 SciencePhysicsCurrent Electricity2 Marks
Question
A voltmeter has a resistance $30\ \Omega.$ What will be its reading, when it is connected across a cell of emf $2\ V$ having internal resistance $10\ \Omega?$
✓

Answer

Data: $E=2 V , r =10 \Omega, R =30 \Omega$ The voltmeter reading, $V= R$
$ =\left(\frac{E}{R+r}\right) R$
$=\left(\frac{2}{30+10}\right) 30$
$=\left(\frac{2}{40}\right) 30$
$=1.5 V $

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