Ohm's law is true for which of the following?

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(A) Ohm's law states that the current flowing through a conductor is directly proportional to the potential difference across its ends,provided the ph

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For metallic conductors at low temperature

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(A) Ohm's law states that the current flowing through a conductor is directly proportional to the potential difference across its ends,provided the physical conditions (like temperature) remain constant.For metallic conductors,Ohm's law holds true as long as the temperature remains constant.At high temperatures,the resistance of metallic conductors increases,causing the $V-I$ graph to become non-linear,which violates Ohm's law.Electrolytes and diodes are non-ohmic devices because they do not follow a linear relationship between $V$ and $I$.Therefore,Ohm's law is primarily applicable to metallic conductors at low or constant temperatures.

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