磁石

1. Origins, structure, and basic meaning

• Structure: 磁石, read じしゃく, combines 磁, magnetism, with 石, stone.
• Basic usage: It refers to a magnet used to move an iron nail or to two magnets whose like poles are arranged face to face.

2. Common pitfalls and similar expressions

• Do not overgeneralize the material
  • The example says that an 鉄の釘, an iron nail, moved. The word alone does not establish that every metal behaves the same way.
• The pole arrangement
  • 同じ極を向かい合わせる describes placing like poles face to face; it does not state that they stuck together.