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Review of Magnetic Forces and Fields

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Table of Contents

Further Reading

1. All magnetic fields are caused by

2. Two wires running parallel to each other experience

3. Two wires running perpendicular to each other experience

4. Two wires running anitparallel to each other experience

5. Einstein derived relativity from

6. The force on a moving charge in the presence of a magnetic field is always

7. The force on a moving charge in a magnetic field is always proportional to

8. The force on a moving charge parallel to a magnetic field is always

9. The force on a charge moving perpendicular to a magnetic field is given by

10. The force on a wire moving perpendicular to a magnetic field is given by

11. The force on a charge moving at some angle θ to a magnetic field is proportional to

12. The total work done by a magnetic field on a moving charge is always

13. The net charge on a wire carrying a current I is

14. The magnetic force is always

15. All magnets have

16. A compass measures

17. The point on the compass of a needle near a current carrying wire always points

18. The magnetic field caused by a wire with current I is:

19. Magnetic field lines near straight wires are always

20. The force, per unit length, between two parallel current carrying wires is defined as

21. The unit of magnetic field, in CGS units, is

22. The magnitude of the magnetic field at a point P caused by a small length of wire, dl , at an angle θ to the vector from dl to P is given by

23. What is the magnitude of the magnetic field of a wire carrying a current of 6×1010 esu/sec, at a distance of 2 cm from the wire?

24. A ring of wire carrying a current creates what kind of magnetic field?

25. On the axis of a current carrying ring of radius b , at what point is the magnetic field maximum?

26. A ring of radius 2 cm carries a current of 3×1010 esu/sec. What is the strength of the magnetic field at the center of the ring?

27. The field inside a long solenoid can be approximated as

28. The magnetic field inside a solenoid is maximum

29. A solenoid of length 1,000 cm has 2,000 turns carrying a current of 6×1010 esu/sec. Because it is so long, it can be approximated near the center as an infinite solenoid. What is the magnetic field strength at the center of the solenoid?

30. A current carrying wire is placed along the axis of a long solenoid. In what direction does the force on the wire point?

31. The field along the axis of an infinitely long solenoid is given by

32. The first right hand rule is used to determine

33. The second right hand rule is used to determine

34. A ring and an infinite solenoid both have the same radius and current. Which one produces a stronger magnetic field on its axis?

35. The divergence of a vector field at a given point is

36. What is the divergence of the field (2x, 2y, 2x) ?

37. What is the divergence of the field (x 2, x + y, z) ?

38. Gauss' theorem relates

39. Gauss' theorem only applies to

40. The curl of a vector field at a given point is

41. The curl measures

42. What is the curl of (2x, 2y, 2z) ?

43. Stokes' Theorem relates

44. The line integral around any closed loop in an electric field is equal to

45. The line integral around any closed loop in a magnetic field is equal to

46. The curl of any magnetic field is

47. The divergence of any magnetic field is

48. The fact about the divergence in a magnetic field is due to

49. Jda is equal to

50. How many licks does it take to get to the center of a tootsie roll pop?