Idea 1of 7Builds onA push or a pull
Two ends, never one
Cut a magnet in half. What do you get?
Today you'll discover
- what the two ends of a magnet do
- what cutting one in half gives you
- the name for an end
Think firstA bar magnet is sawn in half
A bar magnet is sawn in half. What are the two pieces?
Decide first, then press Next. Watch which ends push and which ends pull.
A bar magnet drawn as a block with one end shaded. After a prediction, its two ends are labelled north and south, then a curve from one end to the other shows which ends pull together. The last step moves a compass beside the magnet and asks which end its needle's north swings toward.
See the whole ideathe big idea and the key word, in one place
The big idea
Two magnets: a pole always comes with its partner.
Easy to get wrongA pole is not a charge. Charges can be separated, one plus here and one minus there; poles cannot. Nothing flows out of a north pole.
Key word
- pole
- one of the two ends of a magnet, north or south; poles always come in pairs, like poles repel and unlike poles attract
About this modelField lines are closed loops that never cross; a compass needle lies along the line where it sits.
Field lines are closed loops that never cross; a compass needle lies along the line where it sits.
Ready to use it?
- Say which way two described magnets push or pull, and what cutting one in half produces.