Q. In a triode valve
A) If the grid voltage is zero then plate current will be zero
B) If the temperature of filament is doubled, then the thermionic current will also be doubled
C) If the temperature of filament is doubled, then the thermionic current will nearly be four times
D) At a definite grid voltage the plate current varies with plate voltage according to Ohm’s law
Explanation
The correct answer is Option C: If the temperature of filament is doubled, then the thermionic current will nearly be four times.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.