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Which of the following circuits represents a forward biased diode? [Figure: five circuits, each a diode between a left terminal and a right terminal. (A) left -10 V, diode pointing right, right 0 V. (B) left -10 V, diode pointing right, right -15 V. (C) left 4 V, diode pointing right, right 2 V. (D) left -5 V, diode pointing left, right -10 V. (E) left grounded, diode pointing left, right 2 V.] Choose the correct answer from the options given below.

Asked in JEE Main 22nd Jan 1st Shift 2025 · Biasing and I-V characteristics

Figure: Biasing and I-V characteristics
Answer: (3) (B), (C) and (E) only

Step-by-step solution

Forward bias means the anode (the side the arrow starts from) is at a higher potential than the cathode.

(A) anode -10, cathode 0: reverse.

(B) anode -10, cathode -15: forward.

(C) anode 4, cathode 2: forward.

(D) the arrow points left, so the anode is at -10 and the cathode at -5: reverse.

(E) the arrow points left, so the anode is at 2 and the cathode at 0: forward.

Forward biased: (B), (C), (E).

Why the other options are wrong

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