Across
- 3. chinese admiral and sailor who greatly explored the indian ocean. Believed to have invented the compass
- 6. multilooped wire coil mounted on an axle to rotate in a magnetic field, driving electric motors in the process
- 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
- 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
- 11. igneous rock that is dominated by the silicates pyroxene, amphibole, olivine, and mica
- 12. the magnetic force on this is perpendicular to both the wire and the magnetic field with direction given by the right hand rule
- 13. magnetic device used to indicate the direction of earth's north and south magnetic poles
- 14. a lot of this field (pun intended) is thanks to the experimentation of this 19th-century scientist
- 15. when two like poles are near ferromagnetic material magnetized by heating it and subjecting it to a magnetic field
- 18. number of field lines passing through a surface perpendicular to the lines
- 20. magnetizing something through contact
- 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
- 22. only naturally magnetic mineral
Down
- 1. device used to measure very small currents. Its coil rotates in proportion with the magnitude of current
- 2. area of atoms with similar direction of polarization within a material
- 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
- 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
- 7. you won’t find your ordinary magnetic field here; this magnet involves a special type induced by current
- 9. a Danish physicist and chemist who discovered that electric currents create magnetic fields, which was the first connection found between electricity and magnetism
- 13. magnetic field lines are continuous, forming closed loops without beginning or end
- 14. even magnetic fields exert this whenever there is a change in direction
- 16. a cylindrical coil of wire acting as a magnet when carrying electric current
- 17. site where mechanical energy is actually converted to electrical energy. Consists of a number of wire loops in a magnetic field
- 19. North and south ends of earth or any other magnetic field attract when two opposite poles are near