Concepts Of Physics MCQ Edition [Volume 2]
- Exam
- Concepts Of Physics MCQ Edition [Volume 2]
- Subject
- Physics
- Chapter
- Electric Current through Gases
Concepts Of Physics MCQ Edition [Volume 2] · Physics · Electric Current through Gases
In a triode valve, the plate current reaches its maximum value when...
In a triode valve, the plate current reaches its maximum value when the grid potential is
Options
- Anonpositive
- Bpositive
- Cnegative
- Dzero
Correct answer
B. positive
Step-by-step solution
In a triode valve, the grid is placed between the cathode and the plate to control the flow of electrons.
When the grid is given a positive potential with respect to the cathode, it attracts the electrons emitted by the cathode. This positive potential helps in neutralizing the space charge effect and accelerates a large number of electrons towards the plate.
As a result, the plate current increases significantly. When the grid potential is sufficiently positive, almost all the electrons emitted by the cathode are pulled towards the plate, and the plate current reaches its maximum (saturation) value.
When the grid is given a positive potential with respect to the cathode, it attracts the electrons emitted by the cathode. This positive potential helps in neutralizing the space charge effect and accelerates a large number of electrons towards the plate.
As a result, the plate current increases significantly. When the grid potential is sufficiently positive, almost all the electrons emitted by the cathode are pulled towards the plate, and the plate current reaches its maximum (saturation) value.