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  4. Ohm's law is not obeyed by:

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Q. Ohm's law is not obeyed by:

AFMCAFMC 2003Electromagnetic Induction

Solution:

Ohm's law is true for metallic conductors only.
According to this law, if there is no change in the physical state of a conductor (such as temperature)
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then the ratio of the potential difference applied at its ends and the current flowing through it is a constant. If a graph be drawn between the applied potential difference $V$ and the current $i$ flowing through the conductor then it will be a straight line. Ohm's law is true for metallic conductors only. Hence, electrolytes, discharge tubes and vacuum tubes do not obey Ohm's law.