Ohm's law is true

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For electrolytes when current passes through them

For metallic conductors at high temperature

For metallic conductors at low temperature

For diode when current flow

answer is A.

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Detailed Solution

Ohm's law is true for metallic conductors at low temperatures. "In metallic conductors at constant temperature and zero magnetic fields, the current flowing is proportional to the voltage across the ends of the conductor, and is inversely proportional to the conductor's resistance," according to Ohm's Law.

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