(A) : A current carrying conductor produces only an electric field.
(R) : Electrons in motion in a current carrying wire give rise to a electric field

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

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**:
- The assertion states: "A current carrying conductor produces only an electric field."
- To evaluate this, we need to recall the properties of a current-carrying conductor. According to electromagnetic theory, a conductor carrying an electric current generates both an electric field and a magnetic field around it.

2. **Conclusion on Assertion (A)**:
- Since a current-carrying conductor produces both an electric field and a magnetic field, the assertion is **false**.

3. **Understanding the Reason (R)**:
- The reason states: "Electrons in motion in a current carrying wire give rise to an electric field."
- In a current-carrying wire, the flow of electrons constitutes an electric current. The movement of these electrons indeed creates an electric field within the wire and in the surrounding space.

4. **Conclusion on Reason (R)**:
- The reason is **true** because the motion of electrons is responsible for the generation of the electric field.

5. **Final Evaluation**:
- We have established that assertion (A) is false and reason (R) is true. Therefore, the correct answer is that assertion (A) is false and reason (R) is true.

### Summary:
- Assertion (A): False
- Reason (R): True