Assertion: If we see along the axis of a chaged ring, the magnitudeof electric field is minimum at centre and magnitude of electridc potential is maximum.
Reason: Electric field is a vector quantity while electric potential is scalar.

Options

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

Explanation

To solve the given question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
The assertion states that when observing along the axis of a charged ring, the electric field is minimum at the center, while the electric potential is maximum at that point.

2. **Electric Potential Calculation**:
The electric potential \( V \) at a point along the axis of a charged ring can be expressed as:
\[ V_P = \frac{1}{4 \pi \epsilon_0} \frac{Q}{\sqrt{r^2 + x^2}} \]
where \( Q \) is the total charge on the ring, \( r \) is the radius of the ring, and \( x \) is the distance from the center of the ring along the axis.

3. **Finding Maximum Potential**:
At the center of the ring, when \( x = 0 \):
\[ V_P = \frac{1}{4 \pi \epsilon_0} \frac{Q}{r} \]
This shows that the potential is maximum at the center of the ring since moving away from the center (increasing \( x \)) will increase the denominator and thus decrease \( V_P \).

4. **Electric Field Calculation**:
The electric field \( E \) at the center of the charged ring can be analyzed by considering the contributions from each infinitesimal charge element on the ring. Due to symmetry, the horizontal components of the electric field from opposite charges will cancel out.

5. **Finding Minimum Electric Field**:
At the center of the ring, the net electric field \( E \) is:
\[ E = 0 \]
This indicates that the electric field is indeed minimum (zero) at the center of the ring.

6. **Conclusion on Assertion**:
Since the electric field is minimum (zero) at the center and the electric potential is maximum at that point, the assertion is correct.

7. **Understanding the Reason**:
The reason states that the electric field is a vector quantity while the electric potential is a scalar quantity. This is a true statement.

8. **Evaluating the Reason as Explanation**:
However, while the reason is correct, it does not directly explain why the electric field is minimum and the potential is maximum at the center of the ring. The cancellation of electric field vectors due to symmetry is the key point, which is not addressed by the reason.

9. **Final Evaluation**:
Therefore, both the assertion and reason are correct, but the reason does not correctly explain the assertion.

### Final Answer:
The correct option is that the assertion is true, the reason is true, but the reason is not the correct explanation of the assertion.

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