The resistance of a discharge tube is (a) zero (b) ohmic (c) non-ohmic (d) infinity

Answer: (c). In a discharge tube current is carried by ionised gas; I is not proportional to V (no current until breakdown, then current rises sharply). So V/I is not constant: the resistance is non-ohmic, answer (c).

The resistance of a discharge tube is | NEET 1999 (AIPMT)

Q74NEET 1999 · AIPMTEasy

Ohm's Law, Resistivity & Temperature

The resistance of a discharge tube is

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Answer: (c)

In a discharge tube current is carried by ionised gas; $I$ is not proportional to $V$ (no current until breakdown, then current rises sharply).
So $V/I$ is not constant: the resistance is non-ohmic, answer (c).

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Ohm's Law, Resistivity & Temperature question from NEET 1999 (AIPMT)

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