1. PHYS 270 – SUPPL. #6 DENNIS PAPADOPOULOS FEBRUARY 11, 2010

2. Hydro-Electric Station www.opg.com/power/hydro/howitworks.asp Watch movie at

3. Hydroelectric Power From last lecture

4. TETHERED SATELLITE SYSTEM EMF=vlB= (8 km/sec) (20 km)(.3 x10 -4 T)=4.8 kV R= 4.8 kV/1A=4800 OhmP=I(EMF)=4.8 kW

5. Falling magnet slows down as it approaches a copper ring immersed in liquid Nitrogen Why ? and what is the use of liquid Nitrogen ?

6. Falling magnet slows down as it approaches a copper ring immersed in liquid hydrogen Insert movie for falling magnet

15. MAGNETIC FLUX CONVENTIONS  cos  UNIFORM B NON-UNIFORM B

16. N number of loops in a coil What about the minus sign ?

19. LENZ’s LAW APPLICATION

20. Falling magnet – changes Magnitude of B Copper Ring Falling towards a dipole magnet

21. Will be discussed in detail during recitation

27. EDDY CURRENTS Induced current causes force

28. LOOP CURRENT BY TEMPORAL FLUX CHANGE –LENZ’s LAW

29. FARADAY’s LAW

30. GENERATORS – TRANSFORMERS- DETECTORS

32. MAGNETIC FLUX  IS THE ANGLE THE AXIS OF THE LOOP MAKES WITH THE DIRECTION OF B