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# lecture18 - Magnetism(3 weeks CHAPTER 29 Magnetic fields...

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Magnetism (3 weeks) CHAPTER 29 : Magnetic fields exert a force on moving charges. CHAPTER 30 : Moving charges (currents) create magnetic fields. CHAPTERS 31, 32 : Changing magnetic fields create electric fields. (Induction) Magnetic fields Text sections 29.1 – 29.2 •Magnetic poles, forces, and fields •Force on a moving charged particle •Force on a current-carrying wire For practice: Chapter 29, problems 1, 2, 5, 9, 11, 13

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Magnets and Magnetic Forces A model, similar to electrostatics: Each magnet has two poles at its ends. N S Magnetic poles come in two types, “S” and “N”. Due to the Earth’s magnetism, a magnet will tend to rotate until the “N” end points North. Forces between magnets are due to the forces between each pair of poles, similar to the electrostatic forces between point charges. N N S S S N like poles repel N N unlike poles attract The force gets smaller as distance increases.
N N S Magnetic Field B Magnetic poles produce a field B S The field exerts forces on other poles B B F F Magnetic Dipoles 2 poles, “N” and “S”, of equal strength.

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lecture18 - Magnetism(3 weeks CHAPTER 29 Magnetic fields...

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