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In a potentiometer experiment, the balancing length with a cell is $560 c m$ .When an external resistance of $10$ ohms is connected in parallel to the cell the balancing length changes by $60 c m$ .The internal resistance of the cell in ohms is :

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Correct option is C

Balancing length l1=560 cm Balancing length l2=60 cm Resistance R=10 Ω Internal resistance r=? r=(l1−l2l2)R =(560−500500)10 ∴r=1.2 Ω

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In a potentiometer experiment, the balancing length with a cell is 560 cm .When an external resistance of 10 ohms is connected in parallel to the cell the balancing length changes by 60 cm .The internal resistance of the cell in ohms is :

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In a potentiometer experiment, the balancing length with a cell is $560 c m$ .When an external resistance of $10$ ohms is connected in parallel to the cell the balancing length changes by $60 c m$ .The internal resistance of the cell in ohms is :