Verified Solution • 2025–26 Session moderate

QPage 352: Q3: HC Verma: Concepts of Physics - Volume 2 Electric Current through Gases Page 352: Q3 Solution: Due to the space charge in a diode valve, _________ .

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often mistake the space‑charge cloud for a source of extra electrons and assume it raises plate voltage or saturation current; in reality the negative charge near the cathode repels newly emitted electrons, limiting the plate current (Child‑Langmuir law). Remember: space charge *decreases* current, it does not increase emission or voltage.

Due to the space charge in a diode valve, _________ .

Multiple Choice Options

  • A the plate current decreases
  • B the plate voltage increases
  • C the rate of emission of thermions increases
  • D the saturation current increases

Step-by-Step Verified Solution

**Answer:** (a) the plate current decreases. **Step-by-Step Explanation:** Space charge creates a negative cloud near the cathode that repels electrons, reducing plate current.

All Questions in this Chapter

QPage 351: Q1 QPage 351: Q2 QPage 351: Q3 QPage 351: Q4 QPage 351: Q5 QPage 351: Q6 QPage 351: Q7 QPage 351: Q8 QPage 351: Q9 QPage 351: Q10 QPage 352: Q1 QPage 352: Q2 QPage 352: Q3 QPage 352: Q4 QPage 352: Q5 QPage 352: Q6 QPage 352: Q7 QPages 351-352: Q1 QPages 351-352: Q2 QPages 351-352: Q3 QPages 351-352: Q4 QPages 351-352: Q5 QPages 351-352: Q6 QPages 351-352: Q7 QPages 351-352: Q8 QPages 351-352: Q9 QPages 352-354: Q1 QPages 352-354: Q2 QPages 352-354: Q3 QPages 352-354: Q4 QPages 352-354: Q5 QPages 352-354: Q6 QPages 352-354: Q7 QPages 352-354: Q8 QPages 352-354: Q9 QPages 352-354: Q10 QPages 352-354: Q11 QPages 352-354: Q12 QPages 352-354: Q13 QPages 352-354: Q14 QPages 352-354: Q15 QPages 352-354: Q16 QPages 352-354: Q17 QPages 352-354: Q18 QPages 352-354: Q19 QPages 352-354: Q20 QPages 352-354: Q21 QPages 352-354: Q22 QPages 352-354: Q23

Related Learning Resources & Exam Preparation

Chapter Practice Bank
Practice all topic-wise questions from Electric Current through Gases
Reference Textbook Solutions
Explore complete chapter exercises for HC Verma: Concepts of Physics - Volume 2
Competitive PYQ Question Bank
Browse year-wise authentic previous years' questions with solutions
Authentic CBT Mock Tests
Simulate official exam environment with live timer and percentile scoring