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 acrose the given cell, has values of. <br> (i) infinity $\; \; \; \; \; \; $ (ii) 9.5 Q <br> The 'balancing lengths, on the potentiometer wire are found to be 3m and 2.85 m, respectively. <br> The value of internal resistance of the cell is:

Question

( A ) $0.95 \Omega$
( B ) $0.5 \Omega$
( C ) $0.25 \Omega$
( D ) $0.75 \Omega$