table
Name
Intro to Magnetism
Class Period
Date
gpb 1001
•
Like magnetic poles ________________ .
•
Unlike magnetic poles ________________ .
•
Magnetic field –
Origin of magnets:
lodestone –
Chinese invented the first ________________ .
N pole –
S pole –
Compass –
•
•
The _________________ pole of the earth’s magnetic field is located close to the
_________________ geographic pole.
The N pole of a compass needle is attracted to the earth’s _________________
magnetic pole.
magnetic declination – difference between _________________ and _________________ poles.
Lab Data Table - Which objects are magnetic?
paper clip
penny
aluminum foil
razor blade
nail
straight pin
paper
wood
quarter
zinc
Ferromagnetic elements:
•
•
•
Why aren’t all nails magnets?
Domains •
•
•
_______________ domains
_______________ domains
Hard ferromagnetic materials (alloys) make better permanent magnets than soft iron because -
Dropping a permanent magnet weakens it. Explain.
How will a magnet will be affected by breaking it in two?
How will heating a magnet affect it?
Show what you know:
1. Ferromagnetic materials
a. are strongly attracted to magnets.
b. include iron, cobalt, and nickel.
c. have many unpaired electrons with identical
spins.
d. all of these
2.
Magnetic monopoles
a. would have north or south poles alone.
b. do not exist.
c. both a and b
d. neither a nor b
3.
Microscopic regions of atoms whose electron
spins are the same
a. are called domains.
b. exist in all substances.
c. are always aligned.
d. all of these
4.
Breaking a magnet in two
a. destroys its magnetic properties.
b. makes two smaller magnets.
5.
Which of these actions will not damage the
polarity of a permanent magnet?
a. dropping it
b. heating it
c. breaking it in half
d. none of these