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In which of the following cases is Ohm’s law not applicable?

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In which of the following cases is Ohm’s law not applicable?

(a) Electrolytes

(b) Arc lamps

(c) Insulators

(d) Vacuum ratio values

The question was asked in unit test.

Question is from Ohm’s Law in portion Circuit Elements and Kirchhoff’s Laws of Network Theory

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Correct answer is (c) Insulators

Explanation: According to Ohm’s law, it is applicable only to conductors. Hence, Ohm’s law is not applicable in case of insulators.

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