Hensley, Fitzpatrick crossword

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Across
  1. 4. when magma emerges from the bottom of the ocean this occurs
  2. 5. things such as paper clips can become temporary magnets through
  3. 6. these rocks are rich in magnesium and iron
  4. 9. same charges do this
  5. 13. the rotating coil or coils of a dynamo or electric motor
  6. 15. any interaction that, when unopposed, will change the motion of an object
  7. 16. the changing of earth’s poles magnetically not geographically
  8. 17. The number of magnetic field lines passing through a surface perpendicular to the line is the
  9. 18. scientist who found the connection between electric current and magnetic fields
  10. 21. a method to determine the direction of the magnetic force on a positive moving charge with no apparatus
  11. 23. something that can easily become a temporary magnet is described as
  12. 24. an instrument for detecting and measuring small electric currents
  13. 25. a device that converts motive power into electrical power for use in an external circuit
Down
  1. 1. this device invented by the Chinese uses the earth's magnetic field to point to one of the four cardinal directions
  2. 2. opposite charges do this
  3. 3. wire around which the magnetic field is always perpendicular to the wire
  4. 7. Chinese explorer who voyaged before the age of exploration likely because he was one of the first explorers to have a magnetic compass
  5. 8. an English scientist who conducted experiments that contributed to the study of electromagnetism and electrochemistry
  6. 10. a soft metal core made into a magnet by the passage of electric current through a coil surrounding it
  7. 11. pole the end of a magnet, as well as earth. Can repel or attract
  8. 12. a cylindrical coil of wire acting as a magnet when carrying electric current
  9. 14. a class of rotary electrical machines that converts direct current electrical energy into mechanical energy
  10. 16. a group of neighboring atoms whose poles are aligned
  11. 19. a naturally occurring form of iron known for magnetic properties
  12. 20. equal to the negative of the rate of change of the magnetic flux through the area enclosed by the loop
  13. 22. an electric motor driven by an alternating current