Verified Solution • 2025–26 Session moderate

QPages 351-352: Q7: HC Verma: Concepts of Physics - Volume 2 Electric Current through Gases Pages 351-352: Q7 Solution: A triode is operated in the linear region of its…

⚠️ Common Exam Traps & Conceptual Pitfalls

In the linear region the plate current varies linearly with plate voltage, so the derivative $dI_p/dV_p$ (and thus the dynamic resistance $r_p=Delta V_p/Delta I_p$) is constant. A small change in $V_p$ does not alter $r_p$; students often mistakenly think it will increase or decrease because they confuse this region with the non‑linear saturation or cutoff regions.

A triode is operated in the linear region of its characteristics. If the plate voltage is slightly increased, the dynamic plate resistance will _________ .

Multiple Choice Options

  • A increase
  • B decrease
  • C remain almost the same
  • D become zero

Step-by-Step Verified Solution

**Answer:** (c) remain almost the same. **Step-by-Step Explanation:** In the linear region, the dynamic plate resistance is approximately constant.

All Questions in this Chapter

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