Physics - Current Electricity Question with Solution | TestHub

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$2.0\mathrm{ }\mathrm{V}$and a negligible internal resistance. The potentiometer wire itself is$4\mathrm{ }\mathrm{m}$long. When the resistance,$R,$connected across the given cell, has values of.
$\left(\mathrm{i}\right)$infinity$\left(\mathrm{i}\mathrm{i}\right) 9.5 \mathrm{\Omega }$
The 'balancing lengths, on the potentiometer wire are found to be$3\mathrm{m}$and$2.85\mathrm{ }\mathrm{m},$respectively. The value of internal resistance of the cell is:NEET 2014