QAIPM-2014-Ph-1437: NEET 2014 Physics - Class 12 AIPM-2014-Ph-1437 Solution: A potentiometer circuit has been set up for finding the…

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) $9.5\Omega$ 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 $0.25\Omega$ $0.95\Omega$ $0.5\Omega$ $0.75\Omega$