Assertion: Semiconductor do not obey Ohm's law.
Reason: Current is dertemined by the rate of flow of charge carriers.

Options

A. If both the assertion and reason are true and reason is a true explantion of the assertion.
B. If both the assertion and reason are true but the reason is not true the correct explantion of the assertion.
C. If the assertion is true but reason false
D. If both the assertion and reason are false.

Explanation

To analyze the assertion and reason provided in the question, we can break it down step by step.

### Step 1: Understanding the Assertion
The assertion states that "Semiconductors do not obey Ohm's law."

**Explanation**: Ohm's law states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points, provided the temperature remains constant. This relationship is expressed as V = IR, where R is the resistance.

In the case of semiconductors, the relationship between current and voltage is not linear, especially when we consider devices like diodes and transistors. Instead, the I-V characteristics of semiconductors show a non-linear behavior, indicating that they do not obey Ohm's law in the same way that metals do.

### Step 2: Understanding the Reason
The reason states that "Current is determined by the rate of flow of charge carriers."

**Explanation**: In semiconductors, the current is indeed determined by the movement of charge carriers (electrons and holes). The current can be expressed as I = nAq, where n is the charge carrier density, A is the cross-sectional area, and q is the charge of the carriers. The rate of flow of these charge carriers is influenced by factors such as temperature, doping concentration, and the applied electric field.

### Step 3: Analyzing the Relationship Between Assertion and Reason
Now, we need to determine if the reason supports the assertion.

- The assertion is true: Semiconductors do not obey Ohm's law due to their non-linear I-V characteristics.
- The reason is also true: Current in semiconductors is indeed determined by the rate of flow of charge carriers.

However, while both statements are true, the reason does not directly explain why semiconductors do not obey Ohm's law. The non-linear behavior is due to the properties of the semiconductor materials and their charge carrier dynamics, which is not solely defined by the rate of flow of charge carriers.

### Conclusion
Thus, the correct evaluation is that the assertion is true, the reason is true, but the reason does not adequately support the assertion.

### Final Answer
- Assertion: True
- Reason: True
- Conclusion: The reason does not support the assertion.

---