Ch. 24 Walter Szczech, Nick Plante, Will Popovich

12345678910111213141516171819202122
Across
  1. 3. chinese admiral and sailor who greatly explored the indian ocean. Believed to have invented the compass
  2. 6. multilooped wire coil mounted on an axle to rotate in a magnetic field, driving electric motors in the process
  3. 8. these use slip-ring devices to connect wires to a circuit. One ring is connected to one end of the armature, so when the armature rotates 180°, the reverses direction
  4. 10. with these, charges move in a single direction (as they do in batteries). The wires of the armature connect to a circuit by means of a commutator
  5. 11. igneous rock that is dominated by the silicates pyroxene, amphibole, olivine, and mica
  6. 12. the magnetic force on this is perpendicular to both the wire and the magnetic field with direction given by the right hand rule
  7. 13. magnetic device used to indicate the direction of earth's north and south magnetic poles
  8. 14. a lot of this field (pun intended) is thanks to the experimentation of this 19th-century scientist
  9. 15. when two like poles are near ferromagnetic material magnetized by heating it and subjecting it to a magnetic field
  10. 18. number of field lines passing through a surface perpendicular to the lines
  11. 20. magnetizing something through contact
  12. 21. 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
  13. 22. only naturally magnetic mineral
Down
  1. 1. device used to measure very small currents. Its coil rotates in proportion with the magnitude of current
  2. 2. area of atoms with similar direction of polarization within a material
  3. 4. change in the Earth's magnetic field resulting in the magnetic north being aligned with the geographic south, and the magnetic south being aligned with the geographic north
  4. 5. the formation of new areas of oceanic crust, which occurs through the upwelling of magma at mid ocean ridges and its subsequent outward movement on either side
  5. 7. you won’t find your ordinary magnetic field here; this magnet involves a special type induced by current
  6. 9. a Danish physicist and chemist who discovered that electric currents create magnetic fields, which was the first connection found between electricity and magnetism
  7. 13. magnetic field lines are continuous, forming closed loops without beginning or end
  8. 14. even magnetic fields exert this whenever there is a change in direction
  9. 16. a cylindrical coil of wire acting as a magnet when carrying electric current
  10. 17. site where mechanical energy is actually converted to electrical energy. Consists of a number of wire loops in a magnetic field
  11. 19. North and south ends of earth or any other magnetic field attract when two opposite poles are near