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:

  1. (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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