Verified Solution • 2025–26 Session moderate

QPages 417-418: Q10: HC Verma: Concepts of Physics - Volume 2 Semiconductors and Semiconductor Devices Pages 417-418: Q10 Solution: Diffusion current in a p-n junction is greater than the drift…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume the drift component vanishes in a forward‑biased p‑n junction and claim diffusion is always larger; in reality drift still exists (opposing the diffusion of minority carriers) but its magnitude is smaller than the diffusion of injected majority carriers. Remember to compare the two currents, not to set drift to zero, when judging which dominates.

Diffusion current in a p-n junction is greater than the drift current in magnitude

Multiple Choice Options

  • A if the junction is forward-biased
  • B if the junction is reverse-biased
  • C if the junction is unbiased
  • D in no case.

Step-by-Step Verified Solution

**Answer:** (a) if the junction is forward-biased. **Step-by-Step Explanation:** In forward bias, the diffusion current is much larger than the drift current.

All Questions in this Chapter

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