A bar magnet is moved along the axis of a copper ring placed far away from the magnet. Looking from the side of the magnet, an anticlockwise current is found to be induced in the ring. Which of the following may be true?

Options

A. The south pole faces the ring and the magnet moves towards it.
B. The north pole faces the ring and the magnet moves towards it.
C. The south pole faces the ring and the magnet moves away form it.
D. The north pole faces the ring and the magnet moves away form it.

Answer

To solve the problem, we need to analyze the situation where a bar magnet is moved along the axis of a copper ring and determine the conditions under which an anticlockwise current is induced in the ring.

### Step-by-Step Solution:

1. **Identify the Magnet's Orientation**:
- We have a bar magnet with a North (N) and a South (S) pole. The problem states that the observer sees an anticlockwise current induced in the ring when looking from the side of the magnet.

2. **Understand the Movement of the Magnet**:
- If the North pole of the magnet is moving towards the ring, the magnetic field lines from the North pole are entering the ring. This causes an increase in the magnetic flux through the ring.

3. **Apply Faraday's Law of Electromagnetic Induction**:
- According to Faraday's law, a change in magnetic flux through a loop induces an electromotive force (emf) in the loop. Since the magnetic flux is increasing as the North pole approaches, an induced emf will be generated.

4. **Determine the Direction of Induced Current Using Lenz's Law**:
- Lenz's law states that the direction of the induced current will be such that it opposes the change in magnetic flux. Since the magnetic flux is increasing due to the approaching North pole, the induced current must create a magnetic field that opposes this increase.

5. **Determine the Direction of the Induced Magnetic Field**:
- To oppose the magnetic field due to the North pole (which points out of the ring), the induced current must create a magnetic field that points into the ring. The only way to achieve this is if the induced current flows anticlockwise when viewed from the North pole's side.

6. **Conclusion**:
- Therefore, if the North pole of the magnet is moving towards the ring, the induced current in the ring will be anticlockwise. This corresponds to option B being correct.

7. **Consider the Alternative Situation**:
- If the South pole of the magnet is moving away from the ring, the magnetic flux through the ring will decrease. According to Lenz's law, the induced current will then flow in such a way as to oppose this decrease, which would also result in an anticlockwise current.

8. **Final Answer**:
- Both situations where the North pole approaches the ring and the South pole moves away from the ring can lead to an anticlockwise current in the ring. Thus, options B and C are correct.