Two identical cells, when connected either in parallel or in series, give the same current in an external resistance . The internal resistance of each cell will be _____ . [2023]

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Solution

Q.
Two identical cells, when connected either in parallel or in series, give the same current in an external resistance $5 Ω$ . The internal resistance of each cell will be _____ $Ω$ . [2023]

Ans.
(5)

$\frac{ε}{r + 5} \times 5 = 200 x$ ...(i)

$\frac{ε \times 15}{r + 15} = 300 x$ ...(ii)

$\Rightarrow r = 5 Ω$

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