Answer: 50.
- A 50 Ω
- B 20 Ω
- C 0.02 Ω
- D 200 Ω
Correct answer: A. 50 Ω
Explanation: Dynamic resistance r = ΔV/ΔI = 0.1 V / (2 × 10<sup>-3</sup> A) = 50 Ω.
Conductors have overlapping bands, semiconductors have a small energy gap that can be bridged by heat or doping, and insulators have a large gap that blocks conduction.
Concept context
Band theory, p-n junction, diodes, transistors, logic gates, and integrated circuits.