Verified Solution • 2025–26 Session moderate

QPages 351-352: Q4: HC Verma: Concepts of Physics - Volume 2 Electric Current through Gases Pages 351-352: Q4 Solution: When the diode shows saturated current, dynamic plate…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often equate a saturated current plateau with zero resistance, forgetting that dynamic (small‑signal) resistance is $r_d=\frac{dV}{dI}$. In the saturation region $I$ is independent of $V$, so $dI/dV=0$ and $r_d=\infty$, not zero.

When the diode shows saturated current, dynamic plate resistance is ___________ .

Multiple Choice Options

  • A zero
  • B infinity
  • C indeterminate
  • D different for different diodes

Step-by-Step Verified Solution

**Answer:** (b) infinity. **Step-by-Step Explanation:** In saturation, the current doesn't change with plate voltage, so dynamic plate resistance is infinite.

All Questions in this Chapter

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