Some history: Magnetic effects from natural magnets have been known for a long time. Recorded observations from the Greeks more than 2500 years ago. The word magnetism comes from the Greek word for a certain type of stone (lodestone) containing iron oxide found in Magnesia, a district in northern Greece. Properties of lodestones: could exert forces on similar stones and could impart this property (magnetize) to a piece of iron it touched. | GENERAL PHYSICS II Electromagnetism Thermal Physics 3 5 2008 1 Chapter X Magnetic Field 1. Magnetic interaction and magnetic field 2. Magnetic forces on a moving charged particle and on a current-carrying conductor 3. Magnetic field of a current - magnetic field calculations 4. Amper s law and application 3 5 2008 2 1. Magnetic interaction and magnetic field Magnetic phenomena Some history Magnetic effects from natural magnets have been known for a long time. Recorded observations from the Greeks more than 2500 years ago. The word magnetism comes from the Greek word for a certain type of stone lodestone containing iron oxide found in Magnesia a district in northern Greece. Properties of lodestones could exert forces on similar stones and could impart this property magnetize to a piece of iron it touched. Bar magnet a bar-shaped permanent magnet. It has two poles N and S Like poles repel Unlike poles attract. We say that the magnets can interact each with other. This kind of interaction differs from electric interactions and is called magnetic interaction 3 5 2008
