Which one of the following is non-ohmic resistance ?

Mercury

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Copper

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Nichrome

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Bulb of a torch

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Solution

The correct option is D Bulb of a torch
Mercury, copper and nichrome obey ohm's law i.e. $V = I R$ , thus are called as ohmic resistance whereas bulb of a torch do not obey ohm's law and hence it is a non-ohmic resistance.

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