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Two identical cells each of emf 1.5 \mathrm{~V}are connected in series across a 10 \, \Omega resistance. An ideal voltmeter connected across 10 \, \Omega resistance reads 1.5 \mathrm{~V}.The internal resistance of each cell is_________\Omega.

Option: 1

5


Option: 2

-


Option: 3

-


Option: 4

-


Answers (1)

best_answer


\mathrm{I}=\frac{2 \varepsilon}{10+2 \mathrm{r}}=\frac{1.5}{10}
20 \varepsilon=15+3 \mathrm{r}
\Rightarrow 20 \times 1.5=15+3 \mathrm{r}
\Rightarrow 30=15+3 \mathrm{r}
\mathrm{r}=5 \Omega

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mansi

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