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18 Test426
Material for Chapter 18 Test
| Question | Answer |
|---|---|
| What is any material that attracts iron or things made of iron called? | A magnet |
| What are three properties of magnets? | They all have two poles; they all exert forces on each other; they are surrounded by a magnetic field |
| Where are the strongest magnetic forces at on a bar magnet? | At either pole |
| What is the pole of the magnet that points toward the north called? | The magnet's north pole |
| What is the pole of the magnet that points toward the south called? | The magnet's south pole |
| Can a magnet have only one pole? | No |
| What is the force that can either push the magnets apart or pull them together called? | Magnetic force |
| What does a magnetic force come from? | Spinning electric charges in the air |
| True or False. Poles that are the same repel each other. | True |
| Do opposites truly attract? | Yep |
| What does the magnetic force between magnets depend on? | How the poles of the magnets line up |
| Where does a magnetic field exist? | In the region around a magnet in which magneitc forces can act |
| What are magnetic field lines? | Lines that map out the magnetic field |
| Where are the magnetic field lines closest together? | Near the poles |
| What decides whether or not an object is magnetic? | The object's atoms |
| True or false? Atoms only have north poles. | False; they have both north and south poles |
| What's different about a non-magnetic object's atoms? | They cancel each other out |
| In magnetic atoms, what are the groups of atoms called? | Domains |
| What can domains be compared to? | Tiny magnets within a larger magnet |
| True or false? None of the domains have to line up for the object tobe magnetic. | False; most of them most line up |
| What is it called when a previously magnetized object looses its magnetic properties? | Demagnetizing, demagnetize, demagnetized |
| What are three ways that an object can lose its magnetic properties? | Drop or hit the magnet too hard; put the magnet in a strong magnetic field that's oppostite of its own; heat up the magnet |
| What does heating up a magnet do to the magnet's atoms do? | Makes the atoms vibrate faster |
| Can you make a magnet by magnetizing iron, cobalt, or nickel? | Yes |
| What is a ferromagnet? | A magnet made with iron, nickel, cobalt, or a mixture of these metals |
| What is an electromagnet? | A magnet made be an electric current through a coil of wire, generally with an iron core |
| What are temporary magnets? | A magnet that's easy to magnetize, but looses its magnetization easily |
| What are permanent magnets? | A magnet that's difficult to magnetize, but keeps its magnetic properties longer than temporary magnets |
| True or false? Earth is really one big magnet. | True |
| What is a compass needle really? | A magnet |
| Is Earth's pole a magnetic north pole or a magnetic south pole? | A magnetic south pole |
| How did Earth's magnetic field form? | By the movement of electric charges in the core |
| How does an aurora form? | When charged particles from the sun hit nitrogen and oxygen in the air the atoms get excited and then give off light in many colors |
| What is the aurora in at the north pole called? | Northern lights or aurora borealis |
| What is the aurora at the south pole called? | Southern lights or aurora austrailis |
| How did Oersted come up with electromagnetism? | He was teaching a class and held a compass near a wire carrying an electric current. When the compass was brought near the wire, it no longer pointed north. |
Created by:
whiskers426
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