Science 3/21

magnetic domain

a cluster of billions of atoms that all have magnetic fields that are lined up in the same way

ferromagnetic material

a material that shows strong magnetic effects

proton

a positively charged particle found in the nucleus

bar magnet

a simple rectangular magnet with a north pole at one end and a south pole at the other.

electron

a tiny negatively charged particle that orbits the nucleus

in a magnetized material

all or most of the domains are arranged in the same direction

Which object will be strongly attracted to a magnet?

an iron nail

magnetic poles

any magnet, no matter what its shape, has 2 ends

magnetic poles that are unalike

attract each other

magnetic field lines spread out from one pole

curve around a magnet, and return to the other pole

Ferromagnetic materials retain their magnetism

for a while after the magnetic field is removed.

magnetic field lines

map out the magnetic field around a magnet

element

one of about 100 basic materials that make up all matter

attract

pull together

magnetic poles that are alike

repel each other

Ferromagnetic

strongly attracted to magnets. o Ferromagnetic materials become magnetized when exposed to a magnetic field. o Ferromagnetic materials retain their magnetism for a while after the magnetic field is removed.

magnetism

the attraction of a magnet for another object

nucleus

the core at the center of every atom

permanent magnet

the magnet made of a material that keeps its magnetism

North pole

the part of a magnet that is attracted to the North Magnetic Pole of Earth.

South pole

the part of a magnet that is attracted to the South Magnetic Pole of Earth.

magnetic field

the region around a magnet in which magnetic forces act

atom

the smallest particle of an element that has all the properties of that element

repel

to push away

Magnetize

to turn into a magnet.

Ferromagnetic materials become magnetized

when exposed to a magnetic field.

Two N-S magnets are glued to a sheet of paper. Iron filings are sprinkled, and the table is tapped several times. Which image matches what the filings should look like?

Image A Explanation: The south pole of the magnet on the left is facing the north pole of the magnet on the right. These poles attract each other. So, the two N-S magnets will be attracted. Magnetic field lines will connect the south pole of the magnet on the left to the north pole of the magnet on the right. Image A is the only image showing magnetic field lines connecting the two magnets.

Which of the following is true about poles on magnets?

North poles attract south poles.

Based on the magnetic field lines shown, what is the orientation of the mystery magnet? (S connected to mystery)

S-N Explanation: The magnetic field lines do not connect the N-S bar magnet to the mystery magnet. This pattern indicates that the mystery magnet will be repelled from the N-S bar magnet on the left. A south pole is repelled by another south pole, so the south pole on the mystery magnet must be on the left, facing the south pole of the bar magnet. Therefore the mystery magnet is an S-N magnet.

What will happen to the two magnets below if they are released? (N connected to N)

The magnets will move further apart.