Which of the following factors does NOT affect the resistance of a conductor?

Options

A. Pressure
B. Material
C. Area of cross section
D. Length

Answer

To determine which factor does NOT affect the resistance of a conductor, we can analyze the known factors that do influence resistance.

### Step-by-Step Solution:

1. **Understanding Resistance**:
- Resistance (R) in a conductor is influenced by several factors, including its length (L), cross-sectional area (A), temperature (T), and the material of the conductor (resistivity).

2. **Factors Affecting Resistance**:
- **Length of the Conductor (L)**: Resistance is directly proportional to the length of the conductor. As the length increases, the resistance increases.
\[ R \propto L \]
- **Cross-Sectional Area (A)**: Resistance is inversely proportional to the cross-sectional area of the conductor. A larger area results in lower resistance.
\[ R \propto \frac{1}{A} \]
- **Temperature (T)**: Resistance typically increases with temperature for most conductors. As temperature rises, the resistance also increases.
- **Material of the Conductor**: Different materials have different resistivities. A better conductor (like copper) has lower resistance compared to a poorer conductor (like rubber).

3. **Identifying the Factor That Does NOT Affect Resistance**:
- The question asks for the factor that does NOT affect resistance. Among the common factors listed (length, area, temperature, and material), pressure is not one of them.
- Therefore, pressure does not have any impact on the resistance of a conductor.

4. **Conclusion**:
- The correct answer is that pressure does NOT affect the resistance of a conductor.

### Final Answer:
- The factor that does NOT affect the resistance of a conductor is **Pressure**.