Magnetic field
Magnetic field
Agenda today 1.Magnetic force on a moving charge 2.The motion of single charge in magnetic field 3.Magnetic force on current 4.The Hall effect
Agenda today 1. Magnetic force on a moving charge 2. The motion of single charge in magnetic field 3. Magnetic force on current 4. The Hall effect
Magnet and Magnetic Field North pole and South Pole N Magnetic Field B
Magnet and Magnetic Field N S North pole and South Pole Magnetic Field B
Magnetic force on an electric charge FB=qV×B B The magnitude of the force is: 分q6 In SI unit,1T=1kg/(C.s) 1G=104T
Magnetic force on an electric charge + B v Fmax In SI unit, 1T=1kg/(C·s) G T 4 1 10 The magnitude of the force is:
Lorenz Force E×B The magnitude of the magnetic field is: B= max The direction of magnetic field is that of
The magnitude of the magnetic field is: qv F B max The direction of magnetic field is that of F v max Lorenz Force
Motion of electric charge in magnetic field 1 The circular motion v2 qvB=m R B The radius mv R= X 9B
Motion of electric charge in magnetic field 1 The circular motion F R + v B R v qvB m 2 qB mv R The radius
11-6离子比荷的测定 0113 m1<m2<m3.12 1 加速电场 速度选择器「 A 底片 × XX XXXXXX X ××X×X×X× 4 提示：单击鼠标射出下一个粒子
The period of the 2元R 2n m motion 7、 v gB The cyclotron frequency 1 qB T (回旋频率) 2n m The cyclotron period and frequency are independent of speed
qB m v R T 2 2 The period of the motion m qB T 2 1 The cyclotron frequency The cyclotron period and frequency are independent of speed. （回旋频率）
Cyclotron(回旋加速器) ××××X× XX XX XX XXX 加速器结构图
Cyclotron（回旋加速器）
2 The helical motion V21 B The pitch of helix h=ur=2rm vcos0 gB
2 The helical motion B v 1 v 2 h + v The pitch of helix cos 2 1 v qBm h v T