A potentiometer has uniform potential gradient across it. Two cells connected in series $(i)$ to support each other and $(ii)$ to oppose each other are balanced over $6\,m$ and $2\,m$ respectively on the potentiometer wire. The $e.m.f.$’s of the cells are in the ratio of
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(d) $\frac{{{E_1}}}{{{E_2}}} = \frac{{{l_1} + {l_2}}}{{{l_1} - {l_2}}} = \frac{{(6 + 2)}}{{(6 - 2)}} = \frac{2}{1}$
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