Question

A diode and resistance are connected as shown in figures.

Out of the following statements, which one is true?
Diode in
A) fig (1) and fig (2) are both forward biased.
B) fig (1) and fig (2) are both reverse biased.
C) fig (1) is forward biased and in fig (2) is reverse biased.
D) fig (1) is reverse biased and in fig (2) is forward biased.

• A. D
• B. B
• C. A
• D. C

Hint:

A diode conducts when its anode is at a higher potential than its cathode side.

Answer 1

The Correct Option is A

Step 1: Compute the voltage across each diode:
Fig. 1: $V_{anode} - V_{cathode} = -5 - (-3) = -2$ V. Fig. 2: $0 - (-4) = +4$ V.

Step 2: Read the sign:
A negative value means reverse bias, and a positive value means forward bias.
So Fig. 1 is reverse biased and Fig. 2 is forward biased.

Final Answer:
The diode in Fig. 1 is reverse biased and the diode in Fig. 2 is forward biased, option (A). \[ \boxed{\text{Fig. 1 reverse, Fig. 2 forward}} \]