The V-I graphs A and B are drawn for two volt | vedclass

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(A) $Cu$ voltameter with soluble electrodes obeys Ohm's law,resulting in a linear $V-I$ graph passing through the origin,as shown in graph $B$.In a wa

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$A$ for water voltameter and $B$ for $Cu$ voltameter

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(A) $Cu$ voltameter with soluble electrodes obeys Ohm's law,resulting in a linear $V-I$ graph passing through the origin,as shown in graph $B$.In a water voltameter,there is a back $e.m.f.$ due to polarization. When the applied voltage $V$ is small $(V As soon as $V$ exceeds $1.7 \, V$ (the decomposition voltage),the current increases steadily according to Ohm's law,as shown in graph $A$.

The $V-I$ graphs $A$ and $B$ are drawn for two voltameters. Identify each graph.

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