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JEE Main 2005 (AIEEE) · Electrical Power & Heating Effect

Electrical Power & Heating Effect question from JEE Main 2005 (AIEEE)

Q75JEE Main 2005 · AIEEEMedium

Electrical Power & Heating Effect

Two voltmeters, one of copper and another of silver, are joined in parallel. When a total charge $q$ flows through the voltmeters, 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 voltmeter is

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Answer: (a)

Equal masses: $Z_1q_1 = Z_2q_2$ , and $q_1 + q_2 = q$ .
$q_1 = \frac{Z_2}{Z_1}q_2 \Rightarrow q_2\left(1 + \frac{Z_2}{Z_1}\right) = q$
$q_2 = \frac{q}{1 + \frac{Z_2}{Z_1}}$ . So the answer is (a).

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