Answer: VDS = VGS - Vp (or VGS - Vth).
- A VGS = 0, with the gate-source voltage held at exactly zero
- B VDS = VGS - Vp (or VGS - Vth)
- C ID = 0, as if the drain current vanished largely at pinch-off
- D VGS > 0, a condition with little relation to the actual pinch-off point
Correct answer: B. VDS = VGS - Vp (or VGS - Vth)
Explanation: Pinch-off: depletion region extends across channel. VDS,sat = VGS - Vth. Above VDS,sat: ID saturates (nearly constant).
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.