Magnetism

Terms & Objectives

The Indiana Physics Standards that Relate to Chapter 36 - Magnetism are:

• The Properties of Matter
  • P.1.4 Employ correct units in describing common physical quantities.
• The Nature of Electricity & Magnetism
  • P.1.18 Explain the concepts of ... magnetic field. Use the definitions of ... the tesla.
  • P.1.20 Describe electric and magnetic forces in terms of the field concept and the relationship between moving charges and magnetic fields. Know that the magnitude of the force on a moving particle with charge q in a magnetic field is qvBsin, where v and B are the magnitudes of vectors v and B and is the angle between v and B.
  • P.1.21 Explain the operation of ... motors..

magnetism	magnetic pole	spin
electromagnet	core	turn
magnetic domain	Tesla	Gauss
galvanometer	motor	brush
magnetic declination	convection	monopole
lodestone

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Objectives:

When you finish your study of magnetism you should be able to:

• Magnetic Poles & Fields
  1. tell what a magnetic pole is, and explain why magnetic poles are called "north" and "south".
  2. state that like poles repel and unlike poles attract.
  3. recognize that magnetic poles always occur in pairs - isolated poles (monopoles) have not been observed.
  4. understand that magnetic fields transmit magnetic forces.
  5. interpret magnetic field lines in terms of the magnitude and direction of the magnetic force.
• What Causes Magnetism?
  7. recognize that magnetic fields arise from electric charges in motion.
  8. discuss the roles of electron orbital motion and electron spin in magnetism.
  9. explain, in general terms, why some materials are magnetic while others are not.
  10. tell what a magnetic domain is, and the relation of magnetic domains to the strength of a magnet.
  11. explain how a magnet can attract an unmagnetized object.
• Magnetic Forces & Charges
  12. recognize that moving electric charges generate a magnetic field, and that magnetic fields exert forces on moving charges.
  13. discuss how the magnitude and direction of the magnetic force on a charged particle depends on:
      1. the particle's velocity (speed and direction)
      2. the particle's charge
      3. the strength of the magnetic field
  14. recognize the Tesla and the Gauss as units of magnetic field strength.
  15. interpret the equation F = qvBsinQ in terms of the magnetic force on a moving charge.
• Magnetic Forces & Current
  16. recognize that electric currents generate magnetic fields and that magnetic fields exert forces on electric currents.
  17. discuss the direction of the force on a current-carrying wire with respect to the magnetic field.
  18. sketch the magnetic field:
      1. around a straight, current-carrying wire
      2. within a current-carrying coil
  19. explain the operation of an electromagnet.  
• Meters & Motors
  20. tell what a galvanometer measures.
  21. sketch a simple galvanometer and explain its operation.
  22. sketch a simple dc motor and explain its operation.
  23. compare the operation of a galvanometer and a dc motor. 
• The Earth as a Magnet
  24. tell what magnetic declination is, and discuss why it arises.
  25. discuss some plausible explanations for the Earth's magnetic field.
  26. recognize that the Earth's magnetic field is not stable and discuss, in general terms, how the Earth's magnetic field has changed in the past.

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last update April 9, 2007 by JL Stanbrough