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QPage 352: Q6: HC Verma: Concepts of Physics - Volume 2 Electric Current through Gases Page 352: Q6 Solution: The plate current in a diode is zero. It is possible that…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often confuse the condition for zero plate current with the condition for saturation current, incorrectly assuming that a positive plate voltage always results in a non-zero current. Remember that if the filament temperature is too low (Option D), the emission of electrons is negligible, so the current remains zero even if the plate voltage is positive.

The plate current in a diode is zero. It is possible that ___________ .

Multiple Choice Options

  • A the plate voltage is zero
  • B the plate voltage is slightly negative
  • C the plate voltage is slightly positive
  • D the temperature of the filament is low

Step-by-Step Verified Solution

**Answer:** (a), (b), (d). **Step-by-Step Explanation:** Plate current can be zero if plate voltage is zero (a), slightly negative (b), or if filament temperature is low (d).

All Questions in this Chapter

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