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In the potentiometer arrangement figure the driving cell A has emf and internal resistance r...

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In the potentiometer arrangement figure the driving cell A has emf and internal resistance r The emf of the cell B is to be rechecked has emf and internal resistance 2r The potentiometer wire CD is 100 cm long If balance is obtained the length CJ is Select the correct option s A 50 cm when r 0 B is independent of internal resistance of secondary cell C 50 cm when r 0 D balanced cannot be obtained A B 2r

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