A reverse biased diode is

Options

A.
B.
C.
D.

Answer

To determine which diode is reverse biased, we need to analyze the potential of the P-side and N-side of each diode. A diode is reverse biased when the potential of the N-side is greater than the potential of the P-side.

### Step-by-Step Solution:

1. **Identify the P-side and N-side**:
- In a diode, the P-side is the side where holes are the majority carriers, and the N-side is where electrons are the majority carriers.

2. **Check the potentials for each option**:
- **Option 1**: P-side = -6V, N-side = -3V
- Here, the potential of the N-side (-3V) is greater than the potential of the P-side (-6V). Thus, this diode is reverse biased.

- **Option 2**: P-side = 3V, N-side = 0V
- In this case, the potential of the P-side (3V) is greater than the N-side (0V). Therefore, this diode is forward biased.

- **Option 3**: P-side = 0V, N-side = -2V
- Here, the potential of the P-side (0V) is greater than the N-side (-2V). Thus, this diode is also forward biased.

- **Option 4**: P-side = 2V, N-side = 2V
- In this case, both sides have equal potential (2V). Since neither side is greater, this diode is neither forward nor reverse biased.

3. **Conclusion**:
- The only diode that is reverse biased is **Option 1**.

### Final Answer:
The reverse biased diode is **Option 1**.