Two voltameters, one of copper and another of silver, are joined in parallel. When a total charge $q$ flows through the voltameters, equal amount of metals are deposited. If the electrochemical equivalents of copper and silver are $z_1$ and $z_2$ respectively, the charge which flows through the silver voltameter is :

Question

( A ) $\frac{q}{1+\frac{z_2}{z_1}}$
( B ) $q \frac{z_1}{z_2}$
( C ) $\frac{q}{1+\frac{z_1}{z_2}}$
( D ) $q \frac{z_2}{z_1}$