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In a potentiometer experiment the balancing with a cell is at length 240cm. On shunting the cell with a resistance of 2 $Ω$ , the balancing length becomes 120 cm. The internal resistance of the cell is

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detailed solution

Correct option is D

$r = (\frac{ℓ_{1} - ℓ_{2}}{ℓ_{2}}) R$ = 2 $Ω$

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In a potentiometer experiment the balancing with a cell is at length 240cm. On shunting the cell with a resistance of 2Ω, the balancing length becomes 120 cm. The internal resistance of the cell is