Question

The potentials are applied to the four p-n junctions as shown below. The forward biased p-n junctions are:

• A. (A), (B), and (D) only
• B. (A), (B), and (C) only
• C. (B), (C), and (D) only
• D. (A), (C), and (D) only

Answer 1

The Correct Option is C

To identify forward-biased p-n junctions, the following potential connections are analyzed:

Forward Bias Conditions:

• The positive terminal must be connected to the p-side.
• The negative terminal must be connected to the n-side.
• The applied voltage must exceed the built-in potential.

Junction Bias Analysis:

Junction	Connection	Bias Type
(A)	-ve to p, +ve to n	Reverse
(B)	+ve to p, -ve to n	Forward
(C)	+ve to p, -ve to n	Forward
(D)	+ve to p, -ve to n	Forward

The forward biased junctions are: (B), (C), and (D).

Note: Junction (A) is reverse biased due to its inverted connections.