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In the following, which one of the diodes is reverse biased? [Figure: (a) ground, then a diode pointing right, then R up to +5 V. (b) a terminal at +5 V, a diode pointing left towards it, then R to +10 V. (c) a terminal at -12 V, a diode pointing left towards it, then R down to -5 V. (d) ground, a diode pointing right, then R down to -10 V.]

Asked in JEE Main 2006 · Biasing and I-V characteristics

Figure: Biasing and I-V characteristics
Answer: (1) (a)

Step-by-step solution

(a) Anode at 0 V, cathode connected through R to +5 V. Cathode higher: reverse biased.

(b) Anode via R at +10, cathode at +5: forward.

(c) Anode via R at -5, cathode at -12: forward.

(d) Anode at 0, cathode via R at -10: forward.

Why the other options are wrong

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