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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
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Verified Answer
The correct answer is:
$3: 1$
For potentiometer,
$$
\begin{aligned}
\frac{\mathrm{E}_1}{\mathrm{E}_2} & =\frac{l_1+l_2}{l_1-l_2} \\
\therefore \quad \frac{\mathrm{E}_1}{\mathrm{E}_2} & =\frac{64+32}{64-32} \quad=\frac{96}{32}=\frac{3}{1}=3: 1
\end{aligned}
$$
$$
\begin{aligned}
\frac{\mathrm{E}_1}{\mathrm{E}_2} & =\frac{l_1+l_2}{l_1-l_2} \\
\therefore \quad \frac{\mathrm{E}_1}{\mathrm{E}_2} & =\frac{64+32}{64-32} \quad=\frac{96}{32}=\frac{3}{1}=3: 1
\end{aligned}
$$
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