10.1-11.1 presentations edited

1. 10.1-11.1 presentationsedited 10.1

2. EXAM RESULTS Average=73 Average = 64

3. Which one of the following statements concerning permanent magnets is false? A) The north pole of a permanent magnet is attracted to a south pole. B) All permanent magnets are surrounded by a magnetic field. C) The direction of a magnetic field is indicated by the north pole of a compass. D) Magnetic field lines outside a permanent magnet originate from the north pole and end on the south pole. E) When a permanent magnet is cut in half, one piece will be a north pole and one piece will be a south pole.

4. Which one of the following statements concerning the magnetic force on a charged particle in a magnetic field is true? A) The magnetic force is a maximum if the particle is stationary. B) The magnetic force is zero if the particle moves perpendicular to the field. C) The magnetic force is a maximum if the particle moves parallel to the field. D) The magnetic force acts in the direction of motion for a positively charged particle. E) The magnetic force depends on the component of the particle's velocity that is perpendicular to the field.

5. Which one of the following statements best explains why a constant magnetic field can do no work on a moving charged particle? A) The magnetic field is conservative. B) The magnetic force is a velocity dependent force. C) The magnetic field is a vector and work is a scalar quantity. D) The magnetic force is always perpendicular to the velocity of the particle. E) The electric field associated with the particle cancels the effect of the magnetic field on the particle.

6. Forces on Charges

7. More Clickering … • A charged particle enters a uniform magnetic field and follows the circular path shown in the drawing. • The charge on the particle is: • A Positive • B Negative • C Neutral • D North • E South

8. Look at the direction of the force and the velocity

11. Off Angle P

12. The Unit’s Experimental Set-up Force on a Wire

13. Use the VERTICAL setup as shown here. Change in Unit Plates are optional but you should try them.

14. Get To Work!

15. MM* *More Magnetism 10.2

16. The Magnetic Sector Mass Spectrometer Detector Array

17. An electrical current is flowing out of the page. Looking INTO the current, the magnetic field is A Clockwise B Zero C Counterclockwise

18. A current carrying conductor is oriented as shown in the diagram. The FORCE on the wire with respect to the diagram is: A Left B Right C In D Out E Up or Down N S I

19. A current carrying conductor is oriented as shown in the diagram. The FORCE on the wire with respect to the diagram is: A Left B Right C In D Out E Up or Down N S I v B

20. Two parallel wires have electric currents that are flowing in the same direction. The two wires will A Attract B Repel C Have no interaction

21. Force on a Wire Carrying a Current in a B Field

22. Magnetic field of long straight conductor – • Placed over a compass, the wire would cause the compass needle to deflect. This was the classic demonstration done by Oersted as he demonstrated the effect.

23. Result r The permeability constant (μ0), also known as the magnetic constant or the permeability of free space, is a measure of the amount of resistance encountered when forming a magnetic field in a classical vacuum. The magnetic constant has the exact (defined) value µ0 = 4π×10−7 ≈ 1.2566370614...×10−6 H·m−1 or N·A−2).

24. Force Between Two Current Carrying Conductors First wire produces a magnetic field at the second wire position. The second wire therefore feels a force = Bil

25. Two Wires

26. Today’s Experiment

27. The Experiment Change in Unit Plates are optional but you should try them.

28. Get to Work

29. How about a QUIZ???

30. Still More Magnetism L-10.3

31. The Quiz 2 r=a 1 Current out

32. Klicquer Question PHYSICS A  Points A, B and C form an equilateral triangle. Two parallel wires at B and C carry equal currents into the page. As a result of these two currents, what is the DIRECTION of the magnetic field at point A? A To the right B To the Left C Down D Up E In or out of the plane of ABC x x B C

33. Discussion PHYSICS A  A - Right x x B C

34. Kratos Profile HV-3 Gas Chromatograph & Direct Probe Mass Spectrometer Description Medium resolution double focusing (E/B) magnetic sector mass spectrometer with gas chromatograph and direct probe inlets; electron impact and chemical ionization sources.

36. EXAMPLE: Molecular structure and mass spectrum of 1-acetyl-4-(2-pyridyl)piperazine. The mass spectrum was obtained with a Perkin-Elmer ion trap detector.

37. Last Time – Force on a Wire

38. Let’s talk about torque Current Loops in Magnetic Fields

39. Current Loop What is force on the ends?? Loop will tend to rotate due to the torque the field applies to the loop.

40. pivot The Loop (From the top) OBSERVATION Force on Side 2 is out of the paper and that on the opposite side is into the paper. No net force tending to rotate the loop due to either of these forces. The net force on the loop is also zero,

41. The other sides t1=F1 (b/2)Sin(q) =(B i a) x (b/2)Sin(q) total torque on the loop is: 2t1 Total torque: t=(iaB) bSin(q) =iABSin(q) (A=Area)

42. For a Coil of N Turns t=N(iaB) bSin(q) =NiABSin(q) DEFINE Magnetic Moment m:

43. Galvanometer This is a very sensitive instrument and is easily damaged.

44. Another Application: The motor • If the conductor is a loop, the torque can create an electric motor.

45. What were your results last time? was f~bil?? Last Unit:

46. To Work

47. Coils and Lentz The Old and the New Magnetism 11.1

48. What the heck are we doing this week? 1 We will complete the chapter 2 We will look at Evil Lentz 3 We will complete the current and the next unit! 4 There will be a Friday Quiz

50. Coils Company Logo