Ratio E1 : E2 from balancing lengths with one cell alone and with the two cells opposing

1. A.
   $\frac{l_1}{l_1 + l_2}$
2. B.
   $\frac{l_1}{l_1 - l_2}$
3. C.
   $\frac{l_1 + l_2}{l_1}$
4. D.
   $\frac{l_1 + l_2}{l_1 - l_2}$

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1. A.
   $\frac{l_{1}}{l_{1} + l_{2}}$
2. B.
   $\frac{l_{1}}{l_{1} - l_{2}}$
3. C.
   $\frac{l_{1} - l_{2}}{l_{1}}$
4. D.
   $\frac{l_{1} + l_{2}}{l_{1} - l_{2}}$

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1. A.
   $(l_1) : (l_1 + l_2)$
2. B.
   $(l_1) : (l_1 - l_2)$
3. C.
   $(l_1 + l_2) : (l_1)$
4. D.
   $(l_1 + l_2) : (l_1 - l_2)$

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