Answer: Depletion region narrows and current flows.
- A Depletion region widens, blocking nearly all current flow
- B No current flows because the barrier potential is unaffected
- C Depletion region narrows and current flows
- D Only holes move across the junction while electrons stay fixed
Correct answer: C. Depletion region narrows and current flows
Explanation: Forward bias: positive voltage on p-side, negative on n-side. Depletion region narrows and current flows through the junction.
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.