Electromagnetic induction

Electromagnetic induction:

1. Magnetic flux      Flux linkage         Magnitude of the induced emf       The meaning of positive and negative emf        Normal to a surface and boundary orientation          Faraday's law

2. Changing magnetic field

   • Moving magnet

   • AC current

3. Changing area

   • Rail gun

4. Changing orientation

   • Rotating coil in uniform magnetic field          Maximum flux       Maximum emf   

   • AC generator with brushes 

   • DC motor  and back emf                 

5. Lenz's law - nature opposes  the changing flux        Lenz's law vs right hand rule        Two loops

6. Eddy currents          Magnetic braking         Heating by induction         

7. Transformer      V2 / V1 = N2 / N1       Efficiency and eddy currents         ( eff ) * P1 = P2

8. AC voltage and current        <P> = Irms  *   Vrms          Self-induces emf