A: A system can have magnetic moments even though its net charge is zero.
R: Magnetic moment is created by charges in motion.

Options

A. If both Assertion & Reason are the true and the reason is the correct explanation of the assertion, then mark (1)
B. If both Assertion & Reason are true but the reson 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 question, we need to analyze the assertion (A) and the reason (R) provided.

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**:
- The assertion states that a system can have magnetic moments even though its net charge is zero.
- This is true because a system can consist of charged particles that are arranged in such a way that their individual charges cancel out, resulting in a net charge of zero. However, the arrangement and motion of these charges can still produce a magnetic moment.

2. **Understanding the Reason (R)**:
- The reason states that magnetic moment is created by charges in motion.
- This is also true. A magnetic moment arises when charges move, such as in a current loop. The movement of charges creates a magnetic field, which is represented by the magnetic moment.

3. **Connecting Assertion and Reason**:
- The assertion (A) and reason (R) are related. The reason explains why the assertion is true. Even if the net charge is zero, the motion of charges can still create a magnetic moment.
- For example, consider a neutron, which has a net charge of zero but possesses a magnetic moment due to its internal structure and the motion of its constituent particles.

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

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

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