Four diode connections are given below. Identify the diagram in which the diode is forward biased.

Choose the correct answer from the options given below.

(B) and (D) only

The correct answer is Option (2) → (B) and (D) only

Reason (B): Anode is at the +10 V side and cathode at +5 V side, so

$V_{anode}=+10\ \text{V} > V_{cathode}=+5\ \text{V}$ → diode forward biased.

Reason (D): Anode is connected (via R) to −5 V and cathode to −12 V, so

$V_{anode}=-5\ \text{V} > V_{cathode}=-12\ \text{V}$ → diode forward biased.