Resistance of a voltameter is 2 Ω Ω , it is connected in series to a battery of 10 V through a resistance of 3 Ω Ω . In a certain time mass deposited on cathode is 1 gm. Now the voltameter and the 3 Ω Ω resistance are connected in parallel with the battery. Increase in the deposited mass on cathode in the same time will be
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Remember mass of the metal deposited on cathode depends on the current through the voltameter and not on the current supplied by the battery. Hence by using m = Zit, we can say 
⇒ ⇒ 
.
Hence increase in mass = 2,5 – 1 = 1.5 gm
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