Ch 24

4. a thing that generates something, in particular.
5. current flowing through a loop of wire
8. igneous rock that is rich in magnesium and iron, and is thus a portmanteau of magnesium and ferric
9. Every particle in this material is a dipole
10. the lines
11. they repel or attract
12. the palm of your hand indicates the direction of this
15. has done this many times; no discernible pattern
17. how you find the direction of field
18. number of field lines passing through a surface perpendicular
19. the Earth’s mafic seafloor rocks are magnetically striped
20. groups of atoms near each other that are polarized
23. voyages extensively before the Age of Exploration begins
26. multi looped wire coil
27. connection between electric current and magnetic fields was discovered by

1. temporary magnets are magnetized by this
2. magnetic field lines
3. measures tiny amounts of current
6. magnetic field around this is always perpendicular to the wire
7. any of a class of rotary electrical machines that converts direct current electrical energy into mechanical energy.
13. group of loops
14. an instrument containing a magnetized pointer that shows the direction of magnetic north and bearings from it.
16. like charges
21. an electric motor driven by an alternating current.
22. a gray-black magnetic mineral that consists of an oxide of iron and is an important form of iron ore.
24. opposites charges
25. performed many experiments involving electricity and magnetism.