Question

A student runs a bar magnet through a heap of paper clips. When she takes it out, she finds the paper clips attached to the magnet as shown in the picture below. Why do the paper clips stick to the ends of the magnet only and not in the middle of the magnet?

1. The ends represent the poles of the magnet.
2. The magnetism is strong near the ends of a bar magnet.
3. The magnetism is weak near the ends of a bar magnet.
4. None of the above.