Verified Solution • 2025–26 Session moderate

QPages 351-352: Q5: HC Verma: Concepts of Physics - Volume 2 Electric Current through Gases Pages 351-352: Q5 Solution: The anode of a thermionic diode is connected to the negative…

⚠️ Common Exam Traps & Conceptual Pitfalls

In a thermionic diode electrons are emitted from the cathode and drift toward the anode. If the anode is connected to the negative terminal, the device is reverse‑biased and no appreciable electron flow occurs; students often mistakenly think a negative anode will supply electrons and expect current from anode to cathode. Remember that conventional current is opposite to electron flow and reverse bias blocks the current.

The anode of a thermionic diode is connected to the negative terminal of a battery and the cathode to its positive terminal.

Multiple Choice Options

  • A No appreciable current will pass through the diode.
  • B A large current will pass through the diode from the anode to the cathode.
  • C A large current will pass through the diode from the cathode to the anode.
  • D The diode will be damaged.

Step-by-Step Verified Solution

**Answer:** (a) No appreciable current will pass through the diode. **Step-by-Step Explanation:** The diode is reverse-biased, so no current flows.

All Questions in this Chapter

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