The reciprocal of resistity of a conductor is

Options

A. conductance
B. capacitance
C. conductivity
D. none of these

Answer

To solve the question "The reciprocal of resistivity of a conductor is," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definitions**:
- **Resistivity (ρ)**: This is a property of a material that quantifies how strongly it resists the flow of electric current. It is denoted by the symbol ρ (rho).
- **Conductivity (σ)**: This is the measure of a material's ability to conduct electric current. It is the reciprocal of resistivity.

2. **Write the Relationship**:
- The relationship between resistivity and conductivity can be expressed mathematically as:
\[ \sigma = \frac{1}{\rho} \]
- Here, σ (sigma) is the conductivity and ρ (rho) is the resistivity.

3. **Identify the Reciprocal**:
- Since conductivity is defined as the reciprocal of resistivity, we can say:
\[ \text{Reciprocal of resistivity (ρ)} = \sigma \]
- Therefore, the reciprocal of resistivity is conductivity.

4. **Select the Correct Option**:
- Given the options: conductance, capacitance, conductivity, and none of these, we can conclude that the correct answer is **conductivity**.

### Final Answer:
The reciprocal of resistivity of a conductor is **conductivity**.

---