Two cells of emf \( \mathrm{E}_{1} \) and \( \mathrm{E}_{2} \) are ...

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Two cells of emf \( \mathrm{E}_{1} \) and \( \mathrm{E}_{2} \) are to be compared in a potentiometer \( \left(\mathrm{E}_{1}>\mathrm{E}_{2}\right) \). When the cells are used in series correctly, the balancing length obtained is \( 400\) \( \mathrm{cm} \). When they are used in series but \( \mathrm{E}_{2} \) is connected with reverse polarities, the balancing length obtained is \( 200 \mathrm{~cm} \). Ratio of emf of cells is
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