In order to determine the e.m.f. of a storage battery it was connected in series with a standard cell (both are adding) in a certain circuit and a current I₁ was obtained. When polarity of the standard cell is reversed, a current I₂. was obtained in the same direction as that of I₁. What is the
e.m.f. $ε_{1}$ of the storage battery? The e.m.f. of the standard cell is $ε_{2}$

Question

Infinity Learn · Accepted Answer

ε$$1+$$ε$$2=$$ $$I1R$$,  ε$$1$$−ε$$2=I2RDividing$$ above two equations, ε$$1$$ $$=$$ $$I1$$ $$+$$ $$I2I1$$ − $$I2$$ε$$2$$

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