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In order to determine the $e.m.f.$ of a storage battery it was connected in series with a standard cell in a certain circuit and a current $I_1$ was obtained. When the battery is connected to the same circuit opposite to the standard cell a current $I_2$ flow in the external circuit from the positive pole of the storage battery was obtained. What is the $e.m.f$. $\varepsilon_1$ of the storage battery? The $e.m.f$. of the standard cell is $\varepsilon_2$.
  • A$\varepsilon_1 = \frac{{{I_1} + {I_2}}}{{{I_1} - {I_2}}}\, \varepsilon_2$
  • B$\varepsilon_1 = \frac{{{I_1} + {I_2}}}{{{I_2} - {I_1}}}\, \varepsilon_2$
  • C$\varepsilon_1 =\, \frac{{{I_1} - {I_2}}}{{{I_1} + {I_2}}} \,\varepsilon_2$
  • D$\varepsilon_1 = \, \frac{{{I_2} - {I_1}}}{{{I_1} + {I_2}}} \, \varepsilon_2$
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