A potentiometer is used for the comparison of e.m.f. of two cells \...

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A potentiometer is used for the comparison of e.m.f. of two cells \( \mathrm{E}_{1} \) and \( \mathrm{E}_{2} \). For cell \( \mathrm{E}_{1} \) the no deflection point is obtained at \( 20 \mathrm{~cm} \) and for \( E_{2} \) the no deflection point is obtained at \( 30 \mathrm{~cm} \). The ratio of their e.m.f.s will be
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