Two identical cells each of emf 1.5 V are connected in series across a 10 resistance. An ideal voltmeter connected across the 10 resistance reads 1.5 V. The internal resistance of each cell is __________ . [2023]

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Solution

Q.
Two identical cells each of emf 1.5 V are connected in series across a 10 $Ω$ resistance. An ideal voltmeter connected across the 10 $Ω$ resistance reads 1.5 V. The internal resistance of each cell is __________ $Ω$ . [2023]

Ans.
(5)

$V = 1 \times 10$

$1.5 = (\frac{3}{10 + 2 r}) \times 10$

$r = 5 Ω$

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