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QPages 419-421: Q20: HC Verma: Concepts of Physics - Volume 2 Semiconductors and Semiconductor Devices Pages 419-421: Q20 Solution: The drift current in a p-n junction is 20.0 �A. Estimate the…
⚠️ Common Exam Traps & Conceptual Pitfalls
Students often plug the given 20 µA directly into $I/e$ using $e=1.6\times10^{-19}\,$C, forgetting to first convert µA to A; this yields a result $10^6$ times too small. Always express the current in amperes before dividing by the elementary charge.
The drift current in a p-n junction is 20.0 �A. Estimate the number of electrons crossing a cross section per second in the depletion region.
Step-by-Step Verified Solution
**Answer:** Number of electrons = 1.25 _ 10__ per second.
**Step-by-Step Explanation:**
Given: Drift current = 20.0 _A = 20 _ 10__ A.
Number of electrons per second = I/e = 20 _ 10__/1.6 _ 10___ = 1.25 _ 10__ .
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