Assertion Two concentric conducting rings of different radii are placed in space. The mutual inductance of both the rings is maximum, if the rings are coplanar.
Reason For two co-axial conducting rings of different radii, the magnitude of magnetic flux in one ring due to current in other ring is maximum when both rings are coplanar.

Options

A. If both Assertion and Reason are corrent and Reason is the corrent 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 ture.

Answer

To solve the given question, we need to analyze the assertion and the reason provided regarding the mutual inductance of two concentric conducting rings.

### Step-by-Step Solution:

1. **Understanding Mutual Inductance**:
- Mutual inductance (M) is a measure of how much the magnetic flux in one coil changes due to the current in another coil. It depends on the geometry and relative positioning of the coils.

2. **Assertion Analysis**:
- The assertion states that two concentric conducting rings of different radii have maximum mutual inductance when they are coplanar.
- When the rings are coplanar, the magnetic field lines produced by the current in one ring effectively link with the other ring, maximizing the magnetic flux through it.

3. **Reason Analysis**:
- The reason states that for two coaxial conducting rings of different radii, the magnetic flux in one ring due to the current in the other is maximum when both rings are coplanar.
- This is true because the magnetic field generated by one ring is strongest in the plane of the ring itself, and thus, when both rings are in the same plane, the magnetic flux linkage is maximized.

4. **Conclusion**:
- Both the assertion and reason are correct statements. The reason correctly explains why the assertion is true. Therefore, the mutual inductance is indeed maximum when both rings are coplanar.

5. **Final Answer**:
- Since both statements are correct and the reason is the correct explanation for the assertion, the answer is **Option A**.