Match these items. 1. de magnete (a) magnetite 2. iron oxide (b) demagnetize 3. man-made magnet (c) william gilbert 4. strength decreases rapidly with distance (d) oersted 5. lines representing the strength and direction of magnetic field (e) lines of force 6. drop or hammer (f) electromagnet 7. small region within a magnet (g) inverse square 8. current-carrying wire has a magnetic field (h) supermagnet 9. very cold (i) domain

WILLIAM GILBERT

De Magnete

MAGNETITE

iron oxide

ELECTROMAGNET

man-made magnet

INVERSE SQUARE

strength decreases rapidly with distance

LINES OF FORCE

lines representing the strength and direction of magnetic field

DEMAGNETIZE

drop or hammer

DOMAIN

small region within a magnet

OERSTED

current-carrying wire has a magnetic field

SUPERMAGNET

very cold

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

the right answer is 0.3 meters per second