Assertion (A): When a p-n junction diode is reverse biased, a feeble reverse current flows known as reverse saturation current
Reason (R ): In reverse bias condition, the minority carries can cross the junction.

Options

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is NOT the correct explanation of A
C. A is true but R is false
D. A is false and R is true

Explanation

To analyze the assertion and reason provided in the question, we can break down the explanation into a step-by-step solution.

### Step-by-Step Solution:

1. **Understanding Reverse Bias in a p-n Junction Diode**:
- When a p-n junction diode is reverse biased, the positive terminal of the voltage source is connected to the n-type material and the negative terminal is connected to the p-type material. This configuration increases the width of the depletion region.

**Hint**: Remember that in reverse bias, the voltage applied opposes the built-in potential of the diode.

2. **Depletion Region**:
- In reverse bias, the majority carriers (holes in p-type and electrons in n-type) are pulled away from the junction. This leads to an increase in the depletion region where there are very few charge carriers.

**Hint**: The depletion region is crucial because it determines how much current can flow through the diode.

3. **Minority Carriers**:
- Despite the widening of the depletion region, there are still minority carriers present in both the p-type and n-type materials. In the p-type material, the minority carriers are electrons, and in the n-type material, the minority carriers are holes.

**Hint**: Focus on the role of minority carriers in conducting current in reverse bias.

4. **Reverse Saturation Current**:
- The reverse saturation current is the small current that flows due to the movement of these minority carriers across the junction. When the minority carriers cross the junction, they contribute to a feeble current, which is termed as reverse saturation current.

**Hint**: This current is very small compared to the forward current and is almost constant for a given temperature.

5. **Conclusion**:
- Both the assertion (A) and reason (R) are true. The assertion correctly states that a feeble reverse current flows, known as reverse saturation current, when the diode is reverse biased. The reason correctly explains that this current is due to the minority carriers crossing the junction.

**Hint**: Assess whether the reason provides a valid explanation for the assertion.

### Final Answer:
- **Assertion (A)**: True
- **Reason (R)**: True
- The reason is the correct explanation for the assertion.