In a potentiometer experiment, the galvanometer shows no deflection when a cell is connected across $60\, cm$ of the potentiometer wire. If the cell is shunted by a resistance of $6\,\Omega $, the balance is obtained across $50\, cm$ of the wire. The internal resistance of the cell is .............. $\Omega $
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(c) $r = \frac{{({l_1} - {l_2})}}{{{l_2}}} \times R' = \left( {\frac{{60 - 50}}{{50}}} \right) \times 6 = 1.2\,\Omega $
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