(A) : The coil is wound over the metallic frame in moving coil galvanometer.
(R) : The metallic frame help in making steady deflection without any oscillation.

Options

A. Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'.
B. Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'
C. 'A' is true and 'R' is false
D. 'A' is false and 'R' is false

Answer

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

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**:
- The assertion states that "The coil is wound over the metallic frame in moving coil galvanometer."
- In a moving coil galvanometer, the coil is indeed wound around a metallic frame. This is a fundamental design feature of the device.

2. **Understanding the Reason (R)**:
- The reason states that "The metallic frame helps in making steady deflection without any oscillation."
- The metallic frame plays a crucial role in stabilizing the coil's movement. It helps to dampen any oscillations that might occur due to the movement of the coil in the magnetic field. This ensures that the deflection of the galvanometer needle is steady and does not oscillate.

3. **Evaluating the Truth of Each Statement**:
- Both statements are true:
- The assertion (A) is true because the coil is indeed wound over a metallic frame.
- The reason (R) is also true because the metallic frame does help in achieving steady deflection by damping oscillations.

4. **Determining the Relationship**:
- The reason (R) correctly explains the assertion (A). The design of the metallic frame is not just a structural feature; it directly contributes to the functionality of the galvanometer by preventing oscillations.

5. **Conclusion**:
- Since both the assertion and reason are true, and the reason is the correct explanation of the assertion, the final answer is that both A and R are true, and R is the correct explanation of A.

### Final Answer:
Both A and R are true, and R is the correct explanation of A.

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