講者：許永昌老師 1. Contents ( 起 )Discovering magnetism Compass needle : a probe of Magnetic field ( 承 )Moving charge is the source of magnetic field ( 轉 )The.

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講者：許永昌老師 1

Contents ( 起 )Discovering magnetism Compass needle : a probe of Magnetic field ( 承 )Moving charge is the source of magnetic field ( 轉 )The magnetic force on a moving charge  current-carrying wires. Force and Torque on Current loops ( 合 )Microscopic discussion of Magnetic properties of matter. 2

( 起 )Discovering magnetism ( 請預讀 P998~P1000) 1. Definition 2. Interaction 3. No magnetic monopole 4. Differ from electricity 3

4 You should know and be used to these notations.

( 承 )Moving charge is the source of magnetic field ( 請預讀 P1000~P1011) Biot-Savart Law (1875): Permeability constant:  0 =4  Tm/A SI Unit of magnetic field: T (tesla) 5

Moving charges  Current ( 請預讀 P1005~P1006)  t: the time period used for a charge carrier moved from surface 1 to 2.  q: The net charge inside the segment. =the net charge pass through surface 2 during  t

Current Loop ( 請預讀 P1007~P1012) A current loop is as a magnetic dipole. 7

Ampere’s Law & Solenoid ( 請預讀 P1012~P1017) Ampere’s Law: Solenoid: 8 Example:

( 轉 )The magnetic force on a moving charge ( 請預讀 P1018~P1026) Lorentz force: We get 9

Force and Torque on Current loops ( 請預讀 P1026~P1028) 10

( 合 )Microscopic discussion of Magnetic properties of matter ( 請預讀 P1028~P1031) 11