Chapter 26 Sources of Magnetic Field Chapter 26 Sources of Magnetic Field 1. Biot-savart's law 2. Magnetic Flux and Gauss'Law 3. Ampere's Law 4. Magnetic Materials
Chapter 26 Sources of Magnetic Field Chapter 26 Sources of Magnetic Field 1. Biot-Savart’s Law 2. Magnetic Flux and Gauss’ Law 3. Ampere’s Law 4. Magnetic Materials
Chapter 26 Sources of Magnetic Field New words and expressions Biot-Savart's law 毕奥一萨伐尔定律 solenoid 螺线管 toroid 螺绕环 Amperes Loop Law 安培环路定理 paramagnetism 顺磁质 diamagnetism 抗磁质 ferromagnetism 铁磁质 magnetization 磁化强度 isotropic medium 各向同性介质 permeability of magnetic materials 磁导率 hysteresis 磁滞 magnetization Curve 磁化曲线 hysteresis Loop 磁滞回线
Chapter 26 Sources of Magnetic Field New words and Expressions Biot-Savart’s Law 毕奥—萨伐尔定律 solenoid 螺线管 toroid 螺绕环 Ampere’s Loop Law 安培环路定理 paramagnetism 顺磁质 diamagnetism 抗磁质 ferromagnetism 铁磁质 magnetization 磁化强度 isotropic medium 各向同性介质 permeability of magnetic materials 磁导率 hysteresis 磁滞 magnetization Curve 磁化曲线 hysteresis Loop 磁滞回线
Chapter 26 Sources of Magnetic Field 26-6&26-5. Biot-Savart's Law Applications (P613-616) 1.Biot- Savart'sLaw毕奥一萨伐尔定律: (电流元在空间产生的磁场 The current element dl Id dB generates a magnetic field db given by: Idu sin e dB dB 4兀 2 ldl×F rId dB
Chapter 26 Sources of Magnetic Field 26-6&26-5. Biot-Savart’s Law & Applications (P613-616) 1. Biot-Savart’s Law毕奥—萨伐尔定律: (电流元在空间产生的磁场 The current element Idl generates a magnetic field dB given by: I P * I l d B d r I l d r B d 2 0 d sin 4π d r I l B = 3 0 d 4π d r I l r B =
Chapter 26 Sources of Magnetic Field 真空磁导率0=4×10NA2 Magnetic permeability constant in a vacuum The principle of superposition of magnetic field, can be applied for a complete circuit 任意载流导线在点P处的磁感强度 磁感强度叠加原理 B=「d_bldl×F
Chapter 26 Sources of Magnetic Field 真空磁导率 7 2 0 4π 10 N A − − = Magnetic permeability constant in a vacuum The principle of superposition of magnetic field, can be applied for a complete circuit: 3 0 d 4π d r I l r B B = = 任意载流导线在点 P 处的磁感强度 磁感强度叠加原理
Chapter 26 Sources of Magnetic Field 2. The Application of Biot-Savart Law 1) A Long Straight Wire(载流长直导线的磁场P614): For the field near a long straight wire D carrying a current I, Determine the dz个 magnetic field dB Solution: O dB方向均沿 x轴的负方向
Chapter 26 Sources of Magnetic Field 1) A Long Straight Wire (载流长直导线的磁场P614): For the field near a long straight wire carrying a current I, Determine the magnetic field. 2. The Application of Biot-Savart Law: y x z I P C D o 0 r * B d r z dz Solution: 方向均沿 x 轴的负方向 B d