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# lecture17 - Magnetism(3 weeks C HAPTER 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)

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Magnetic fields Magnetic poles, forces, and fields Forceon a moving charged particle Forceon a current-carrying wire
Magnets and Magnetic Forces Similar model to electrostatics: Each magnet has two poles at its ends. B is the magnetic field vector (magnetic flux density) N S Magnetic poles comein two types, “N” and “S”. Due to theEarth’s magnetism, a magnet will tend to rotate until the “N” end points North. (theearth’s north magnetic poleis actually a south pole) Forces between magnets aredueto the forces between each pair of poles, similar to the electrostatic forces between point charges.

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N N S S S N likepoles repel N N unlikepoles attract Theforce gets smaller as distanceincreases.
N N S Magnetic Field B Magnetic poles produce a field B (think of S as a – charge and of N as a + charge) S Theexternal field exerts forces on poles B B F F

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N S Quiz What is thedirection of the forceon a magnetic dipole placed in a uniform magnetic field?
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lecture17 - Magnetism(3 weeks C HAPTER 29 Magnetic fields...

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