Assertion : If a dipole is enclosed by a surface, then according to Gauss's law, electric flux linked with it will be zero.
Reason : The charge enclosed by a surface is zero.

Options

A. If both Assertion and Reason are correct and Reason is the correct explanation of Assertion
B. If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion
C. If Assertion is true but Reason is false
D. If Assertion is false but Reason is true

Answer

To solve the given question, we need to analyze the assertion and the reason provided in the context of Gauss's law.

### Step-by-Step Solution:

1. **Understanding Gauss's Law**:
Gauss's law states that the electric flux (Φ_E) through a closed surface is proportional to the charge (Q_enclosed) enclosed within that surface. Mathematically, it is expressed as:
\[ \Phi_E = \frac{Q_{\text{enclosed}}}{\epsilon_0} \]
where \(\epsilon_0\) is the permittivity of free space.

**Hint**: Remember that electric flux is related to the total charge enclosed by the surface.

2. **Defining a Dipole**:
A dipole consists of two equal and opposite charges, +Q and -Q, separated by a distance (d). When we consider a dipole enclosed by a Gaussian surface, we need to evaluate the total charge within that surface.

**Hint**: A dipole has two charges that cancel each other out.

3. **Calculating Charge Enclosed**:
When a dipole is enclosed by a surface, the total charge enclosed is:
\[ Q_{\text{enclosed}} = +Q + (-Q) = 0 \]
Therefore, the net charge inside the Gaussian surface is zero.

**Hint**: Always sum the charges to find the net charge enclosed.

4. **Applying Gauss's Law**:
Since the charge enclosed is zero, we can substitute this into Gauss's law:
\[ \Phi_E = \frac{0}{\epsilon_0} = 0 \]
This indicates that the electric flux linked with the dipole when enclosed by the surface is indeed zero.

**Hint**: Electric flux is directly dependent on the net charge enclosed.

5. **Evaluating the Assertion and Reason**:
- **Assertion**: "If a dipole is enclosed by a surface, then according to Gauss's law, electric flux linked with it will be zero." This is **true**.
- **Reason**: "The charge enclosed by a surface is zero." This is also **true** and correctly explains the assertion.

**Hint**: Check whether the reason logically supports the assertion.

6. **Conclusion**:
Both the assertion and reason are correct, and the reason is the correct explanation for the assertion. Therefore, the correct answer is that both the assertion and reason are true, and the reason is the correct explanation of the assertion.

### Final Answer:
Both the assertion and reason are correct, and the reason is the correct explanation of the assertion.