Current Electricity Ques 24
24. The resistance of a discharge tube is
(a) zero
(b) ohmic
(c) non-ohmic
(d) infinity
[1999]
Show Answer
Answer:
Correct Answer: 24.(c)
Solution:
- (c) In discharge tube the current is due to flow of positive ions and electrons. Moreover, secondary emission of electrons is also possible. So V-I curve is non-linear; hence resistance is non-ohmic.
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