Physics - Current Electricity Question with Solution | TestHub

Two cells of E.M.F.${\mathrm{E}}_1$and${\mathrm{E}}_2\mathrm{ }\left({\mathrm{E}}_2\mathrm{ }>\mathrm{ }{\mathrm{E}}_1\right)$are connected in series in the secondary circuit of a potentiometer experiment for determination of E.M.F. The balancing length is found to be$825\mathrm{ }\mathrm{c}\mathrm{m}$. Now when the terminals of cell${\mathrm{E}}_1$are reversed, then the balancing length is found to be$225\mathrm{ }\mathrm{c}\mathrm{m}$. The ratio of${\mathrm{E}}_1$and${\mathrm{E}}_2$is