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

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21 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 The value of internal resistance of the cell is AIPMT 2014 1 0 25 9 3 05 O 2 0 959 4 0 75 9

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