Classwork - Chapter 24 Crossword Puzzle

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Across
  1. 2. the rotating coil or coils of a dynamo or electric motor.
  2. 4. was an English scientist who contributed to the study of electromagnetism and electrochemistry. His main discoveries include the principles underlying electromagnetic induction, diamagnetism and electrolysis.
  3. 7. The magnetic force on a current-carrying wire is perpendicular to both the wire and the magnetic field with direction given by the right hand rule
  4. 8. A geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged, while geographic north and geographic south remain the same
  5. 9. pushing an object away from the subject
  6. 12. are constructed with brushes and a commutator, which add to the maintenance
  7. 16. a rock mineral that it is attracted to a magnet and can be magnetized to become a permanent magnet itself
  8. 17. is a region within a magnetic material in which the magnetization is in a uniform direction. This means that the individual magnetic moments of the atoms are aligned with one another and they point in the same direction.
  9. 19. an instrument for detecting and measuring small electric currents.
  10. 20. Magnetic field lines are closed curves leaving from North pole and entering the South pole when you follow them on the outside the magnet
  11. 22. was a great Chinese explorer and fleet commander. He went on seven major expeditions to explore the world for the Chinese emperor and to establish Chinese trade in new areas
  12. 23. do not use brushes; they are very rugged and have long life expectancies
  13. 24. having a high susceptibility to magnetization, the strength of which depends on that of the applied magnetizing field, and that may persist after removal of the applied field. This is the kind of magnetism displayed by iron and is associated with parallel magnetic alignment of neighboring atoms.
Down
  1. 1. a soft metal core made into a magnet by the passage of electric current through a coil surrounding it.
  2. 2. bringing an object closer toward the subject
  3. 3. any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull
  4. 5. the formation of new areas of oceanic crust, which occurs through the upwelling of magma at midocean ridges and its subsequent outward movement on either side.
  5. 6. is a device that converts motive power into electrical power for use in an external circuit
  6. 7. an instrument containing a magnetized pointer that shows the direction of magnetic north and bearings from it.
  7. 10. a cylindrical coil of wire acting as a magnet when carrying electric current.
  8. 11. each of the points near the extremities of the axis of rotation of the earth or another celestial body where a magnetic needle dips vertically.
  9. 13. a Danish physicist and chemist who discovered that electric currents create magnetic fields
  10. 14. through a surface is the surface integral of the normal component of the magnetic field B passing through that surface
  11. 15. to determine the direction of the magnetic force on a positive moving charge, ƒ, point the thumb of the right hand in the direction of v, the fingers in the direction of B, and a perpendicular to the palm points in the direction of F.
  12. 18. a silicate mineral or igneous rock that is rich in magnesium and iron
  13. 21. the process or action of bringing about or giving rise to something.