2)安培假说 任何物质的分子中都存在分子电流,这些分子电 流形成圆电流,相当于一个基元磁体(小磁铁)。 Molecular current 长直螺线管
Molecular current S N 2）安培假说 任何物质的分子中都存在分子电流，这些分子电 流形成圆电流，相当于一个基元磁体（小磁铁）。 长直螺线管 S N I
8 10-2 Magnetic Field Gauss'law in Magnetic field磁感应强度磁场的高斯定理 1 Magnetic field B( Magnetic induction磁感应强度) A moving charge or a current(电流) sets up or creates a magnetic field in the space surrounding it. 运动电荷 电流 磁场
1.Magnetic field (Magnetic induction B 磁感应强度） A moving charge or a current(电流) sets up or creates a magnetic field in the space surrounding it. § 10-2 Magnetic Field Gauss’law in Magnetic field 磁感应强度 磁场的高斯定理 运动电荷 电流 磁场
The magnetic field exerts a force on a moving charge or a current in the field 磁场 作用:电流、运动电荷等 B Like electric field, magnetic field is a vector field. We use the symbol b for magnetic field
The magnetic field exerts a force on a moving charge or a current in the field. Like electric field, magnetic field is a vector field. We use the symbol B for magnetic field. 磁场 作用：电流、运动电荷等 B
Definition of Magnetic Field We take a moving charge( y and g as the test charge. The force on the moving charge by the magnetic field depends on: ()the direction of motion; (2)qv of the moving charge. B (3)the angle 0 between v and B The force on the moving charge is perpendicular to v and B
Definition of Magnetic Field We take a moving charge( and q) as the test charge. V The force on the moving charge by the magnetic field depends on: V B q F (1) the direction of motion; (2) qV of the moving charge. (3) the angle between and . V B The force on the moving charge is perpendicular to V and . B
用运动电荷在磁场中的受力情况来定义: 大小: B MX 磁场B q 方向:小磁针在某点N极的指向规定为该点的磁感强 度B的方向; 单位:特斯拉T(IS)、高斯1特斯拉=10高斯
用运动电荷在磁场中的受力情况来定义: 单位:特斯拉T(IS) 、高斯 1特斯拉=104高斯 大小: qV F B max = 方向:小磁针在某点N极的指向规定为该点的磁感强 度 B 的方向; 磁场 B