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Give any two practical limitations of Oh...

Give any two practical limitations of Ohm's law.

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1. It is not applicable for metallic conductors at very low and very high temperatures. 2. It is not applicable for semiconductors, superconductors, triodes, diodes, thermistors and discharge tubes. 3. Ohm.s law applicable only, when the physical conditions like temperature, pressure and tension remains constant.
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