Q. The resistance of a discharge tube is
A) Zero
B) Ohmic
C) Non-ohmic
D) Infinity
Explanation
(c) In discharge tube, the current is due to flow of positions ions and electrons. Moreover secondary emission of electrons is also possible. So, V –I curve is non-linear, hence its resistance is non-ohmic.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.