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 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

1. A. 0.25
2. B. 0.95
3. C. 0.5
4. D. 0.75

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