Assertion: Magnetic field strength at a point on axial line of a bar magnet is along South to North pole of magnet.
Reason: The magnetic field strength can never be along North to South pole of magnet.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true and reason is not the correct explanation of assertion.
C. If assertion is ture but reason is false.
D. If both assertion and reason are false.

Explanation

To solve the question regarding the assertion and reason about the magnetic field strength at a point on the axial line of a bar magnet, we will analyze both statements step by step.

### Step 1: Understanding the Assertion
The assertion states that the magnetic field strength at a point on the axial line of a bar magnet is directed from the South pole to the North pole of the magnet.

- **Explanation**: The magnetic field lines outside a bar magnet flow from the North pole to the South pole. However, at a point on the axial line (the line extending through both poles), the field is indeed directed from the South pole to the North pole.

### Step 2: Analyzing the Reason
The reason states that the magnetic field strength can never be directed from the North pole to the South pole of the magnet.

- **Explanation**: This statement is misleading. While it is true that the magnetic field lines outside the magnet flow from North to South, the field inside the magnet flows from South to North. Therefore, the statement that it can never be directed from North to South is incorrect, as it can be in certain contexts (like inside the magnet).

### Step 3: Conclusion
Based on the analysis:
- The assertion is **true**: The magnetic field strength at a point on the axial line of a bar magnet is indeed directed from South to North.
- The reason is **false**: The magnetic field strength can be directed from North to South in certain contexts, particularly inside the magnet.

### Final Answer
- **Assertion**: True
- **Reason**: False