Question

unit 2: forces at a distance
fill in the blank with the correct words.

1. the tiny magnetic \particles\ inside a material are called
2. if the magnetic particles in a material are all , the material acts as a

magnet.

1. magnets have two poles: and .
2. similar poles each other, while opposite poles .
3. the area around a magnet where its force can affect objects is called a .

choose the correct answer from the choices for each question.

1. which material is most likely to be attracted to a magnet?

a) plastic
b) iron
c) wood
d) glass

1. what happens if you break a bar magnet in half?

a) you get just a north pole and just a south pole
b) each piece becomes its own magnet with a north and south pole
c) the magnet stops working
d) only one piece is magnetic

1. why do some newer refrigerators not attract magnets?

a) they have too much iron
b) magnets only work on plastic
c) magnets are too weak
d) they are made from metals with little or no iron

1. what do we call the invisible area where a magnets force can be felt?

a) electric field
b) gravity
c) magnetic field
d) radiation zone

1. if the north pole of one magnet is brought near the north pole of another magnet, what will happen?

a) they will repel each other
b) they will attract each other
c) nothing will happen
d) both magnets will lose their magnetism

Explanation:

1. Magnetic Domains: These are the tiny magnetic "particles" in a material.
2. Aligned: When magnetic particles are aligned, the material acts as a magnet.
3. North Pole, South Pole: Magnets have these two poles.
4. Repel, Attract: Similar poles repel, opposite poles attract.
5. Magnetic Field: The area around a magnet where its force can affect objects.
6. Iron (B): Iron is a ferromagnetic material and is attracted to magnets. Plastic, wood, and glass are not.
7. Each piece becomes its own magnet with a north and south pole (B): A magnet always has a north and south pole. Breaking a magnet creates smaller magnets each with their own poles.
8. They are made from metals with little or no iron (D): Iron - containing materials are attracted to magnets. If a refrigerator is made of non - iron (or low - iron) metals, it won't be attracted.
9. Magnetic field (C): This is the defined area around a magnet where its force is felt.
10. They will repel each other (A): Similar poles (north - north or south - south) of magnets repel each other.

Answer:

1. Magnetic Domains
2. Aligned
3. North Pole, South Pole
4. Repel, Attract
5. Magnetic Field
6. B. Iron
7. B. Each piece becomes its own magnet with a north and south pole
8. D. They are made from metals with little or no iron
9. C. Magnetic field
10. A. They will repel each other