1. Principles of Electromechanics Electricity  Motion Electricity  Motion: Motor Motion  Electricity: Generator  Magnetic Field & Faraday’s Law

2. Magnetic Field 1.Generation of magnetic field Permanent Magnet: Electric Current: using right hand rule to determine the field direction Straight current Current coil N S

3. Current  Motion: Current in magnetic field Magnetic field will exert a force on a current Magnetic field will exert a force on a moving charge × × × I F -q V F r

4. Circular Motion: Plane  B × × × -q V F r Circular path: V || =0 Helical path: V ||  0

5. Charges in B field: Applications Mass Spectrometer: Cyclotron (accelerator)

6. Example: Rail Gun Acceleration: 5  10 6 g Final speed: 1 km/s Duration: 1 ms