Q. 9

The cathode of a diode valve is replaced by another cathode of double the surface area. Keeping the voltage and temperature conditions the same, will the plate current decrease, increase or remain the same?

Answer :

The plate current will increase. We know the more the surface area of cathode more number of electrons will be present on it and hence probability of electrons leaving the surface also increases which in turn increase the plate’s current.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Electric Dipole46 mins
Electric field inside cavity37 mins
Electric Flux - Theory46 mins
Electric Charges and Fields - 0556 mins
Test Your Knowledge of Electric Charge & Coulomb's Law47 mins
Check your knowledge of Electric Potential | Quiz45 mins
Electric Charges and Fields - 0352 mins
Electric Charges and Fields - 0155 mins
Electric Charges and Fields - 0946 mins
Electric Charges and Fields - 0854 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses
RELATED QUESTIONS :

Because of the space charge in a diode valve,

HC Verma - Concepts of Physics Part 2