Physics - Current Electricity Question with Solution | TestHub

In potentiometer experiments, two cells of e. m. f. ' $E_1$ ' and ' $E_2$ ' are connected in series $\left(E_1>E_2\right)$, the balancing length is $64\mathrm{cm}$ of the wire. If the polarity of $E_2$ is reversed, the balancing length becomes $32\mathrm{cm}$. The ratio ${\mathrm{E}}_1/{\mathrm{E}}_2$ is