A : The path traced by a positive charge is a field line.
R : A field line can intersect itself.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).
C. If Assertion is true statement but Reason is false, then mark (3).
D. If both Assertion and Reason are false statements, then mark (4).

Answer

To solve the assertion-reason question, we need to analyze both the assertion (A) and the reason (R) provided.

### Step 1: Analyze the Assertion (A)
The assertion states: "The path traced by a positive charge is a field line."

- **Explanation**: This statement is true. When a positive charge is placed in an electric field, it will move along the direction of the electric field. The path that the positive charge takes represents the electric field lines. Electric field lines indicate the direction of the force experienced by a positive charge in the field.

### Step 2: Analyze the Reason (R)
The reason states: "A field line can intersect itself."

- **Explanation**: This statement is false. Electric field lines cannot intersect each other. If two field lines were to intersect, it would imply that at the point of intersection, there are two different directions of the electric field. This is not possible because a charge placed at that point would experience two different forces, leading to confusion about the direction of motion. Therefore, electric field lines are drawn such that they do not cross each other.

### Step 3: Conclusion
Since the assertion is true and the reason is false, we conclude that:

- The correct answer is that the assertion (A) is true, and the reason (R) is false.

### Final Answer
The correct option is: Assertion is true, Reason is false.

---