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In the potentiometer arrangements shown the driving cell D has emfE and internal resistance r...

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In the potentiometer arrangements shown the driving cell D has emfE and internal resistance r The cell C whose emfis to be measure has emfE 2 and internal resistance 2r The potentiometer wire is 100 cm long If balance is obtained the length AJ 7 D G M 1 2 A 50cm B 50 cm C Balance will be obtained only if resistance of AB is r B

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