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
The anode of a thermionic diode is wired to the negative terminal...
The anode of a thermionic diode is wired to the negative terminal of a battery, while the cathode is wired to the positive terminal.
Options
- AA large current will flow through the diode from the cathode to the anode.
- BNo appreciable current will flow through the diode.
- CThe diode will undergo damage.
- DA large current will flow through the diode from the anode to the cathode.
Correct answer
B. No appreciable current will flow through the diode.
Step-by-step solution
In a thermionic diode, the cathode emits electrons when heated.
When the anode is connected to the negative terminal of the battery and the cathode to the positive terminal, the diode is reverse-biased.
The negative potential of the anode repels the electrons emitted by the cathode, preventing them from reaching the anode.
As a result, the circuit remains incomplete and no appreciable current flows through the diode.
When the anode is connected to the negative terminal of the battery and the cathode to the positive terminal, the diode is reverse-biased.
The negative potential of the anode repels the electrons emitted by the cathode, preventing them from reaching the anode.
As a result, the circuit remains incomplete and no appreciable current flows through the diode.