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A voltmeter of resistance $150 \Omega$ connected across a cell of e.m.f. $3 \mathrm{~V}$ reads $2.5 \mathrm{~V}$. What is the internal resistance of the cell?
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Verified Answer
The correct answer is:
$30 \Omega$
Internal resistance,
$\begin{aligned}
\mathrm{r} & =\left[\frac{\mathrm{E}}{\mathrm{V}}-1\right] \mathrm{R} \\
& =\left[\frac{3}{2.5}-1\right] 150 \\
& =30 \Omega
\end{aligned}$
$\begin{aligned}
\mathrm{r} & =\left[\frac{\mathrm{E}}{\mathrm{V}}-1\right] \mathrm{R} \\
& =\left[\frac{3}{2.5}-1\right] 150 \\
& =30 \Omega
\end{aligned}$
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