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A potentiometer circuit has been set up for finding the internal resistance of a given...

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A potentiometer circuit has been set up for finding the internal resistance of a given cell The main battery used across the potentiometer wire has an emf of 2 0 V and a negligible internal resistance The potentiometer wire itself is 4 m long When the resistance R connected across the given cell has values of i infinity ii 9 5 92 the balancing lengths on the potentiometer wire are found to be 3 m and 2 85 m respectively to be m The value of internal resistance of the cell is CBSE AIPMT 2014 a 0 25 c 0 5 2 b 0 95 2 d 0 75

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