Magnets exist everywhere in nature and influence our lives in diverse ways. A magnet is a magnetic substance with special internal structures known as magnetic moments. When two magnets come close to each other, they produce an attractive force, which is defined as magnetic phenomenon. As a common natural law, magnetic phenomena widely exist not only in the Earth’s magnetic field but also among various celestial bodies in the universe. Understanding the principles behind magnetic phenomena is of great significance for us to explore and grasp the operating rules of nature.
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