Physics-
General
Easy
Question
The V-i graphs A and B drawn for two voltameters. Identify each graph
- A for water voltameter and B for
voltameter
- A for voltameter and B for water voltameter
- Both A and B represents voltameter
- None of these
voltameter
voltameter and B for water voltameter
voltameter
The correct answer is: A for water voltameter and B for voltameter
Cu voltameter with soluble electrodes obeys ohms law. In water voltameter, in the beginning when V is small 
very little current flows, the voltameter does not obey ohms law. As soon as V exceeds 1.7 volt (back e.m.f.) the current increases steadily according to ohms law.
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