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Answer: 4. diode with 0 V on left, R, -2 V on right

Key idea: a diode is forward biased when its p-side (the triangle base) is at higher potential than its n-side (the bar side).

In every circuit the p-side is on the left and the n-side joins the resistor on the right.

  • (1) -4 V to -3 V: p lower than n, reverse.
  • (2) -2 V to +2 V: reverse.
  • (3) 3 V to 5 V: reverse.
  • (4) 0 V to -2 V: p higher, so forward.
Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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