Consider the following statements `A` and `B` and identify the correct answer
(A) A Zener diode is always connected in reverse bias to use it as voltage regulator.
(B) The potential barrier of a `p-n` junction lies between `0.1` to `0.3 V`, approximately.

Options

A. a. [1] and [2] are correct
B. b. [1] and [2] are wrong
C. c. [1] is correct, but [2] is wrong
D. d. [1] is wrong, but [2] is correct

Answer

To solve the question, we need to analyze the two statements (A and B) regarding Zener diodes and the potential barrier of p-n junctions.

### Step 1: Analyze Statement A
- **Statement A**: "A Zener diode is always connected in reverse bias to use it as a voltage regulator."
- **Explanation**: A Zener diode is specifically designed to operate in reverse bias. When connected in reverse bias, it maintains a constant voltage across it (known as the Zener voltage) despite changes in the load current. This property makes it ideal for use as a voltage regulator.
- **Conclusion**: Statement A is **True**.

### Step 2: Analyze Statement B
- **Statement B**: "The potential barrier of a p-n junction lies between 0.1 to 0.3 V, approximately."
- **Explanation**: The potential barrier (also known as the built-in potential) of a p-n junction varies depending on the semiconductor material. For silicon-based diodes, the potential barrier is typically around 0.6 to 0.7 V, while for germanium-based diodes, it is approximately 0.3 to 0.35 V. Thus, the statement suggesting a range of 0.1 to 0.3 V is incorrect.
- **Conclusion**: Statement B is **False**.

### Step 3: Determine the Correct Answer
- Based on the analysis:
- Statement A is True.
- Statement B is False.
- Therefore, the correct answer is that **Statement A is correct and Statement B is incorrect**.

### Final Answer
The correct option is **C: 1 correct and 2 is wrong**.

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