Download Guided Reading: Magnetism

Name:
Date:
Guided Reading:
Magnetism
Period:
Start on page 562, Ch. 36 “Magnetism;” answer the following questions as you read:
1. Two magnets will either
or
each other.
2. Rocks called
in Greece.
were found more than 2000 years ago in the region of
3. Which element is in lodestone that gives it its iron properties?
4. What did Hans Christian Oersted discover?
5. Magnets were found to exert forces on current-carrying wires which led to
and
.
Continue on page 563, Ch. 36.1 “Magnetic Poles” answer the following questions as you read:
6. Magnets exert
on each other and are similar to
.
7. What are magnetic poles?
8. The “North” end of a magnet is really “
seeking.”
really “
9.
poles repel;
seeking” while the “
“ end of a magnet is
poles attract.
10. How are magnetic poles different from electric charges?
11. If you break a bar magnet in half, each half
.
12. Given the initial bar magnet at right, label the poles of the rest of the
magnets.
13. Even atoms themselves are
.
Continue on page 564, Ch. 36.2 “Magnetic Fields” answer the following
questions as you read:
14. Define Magnetic Field:
15. The shape of the magnetic field is revealed by
16. The direction of the field outside the magnet is from the
to the
.
Where the lines are
, the field strength is greater. The field is the
strongest at the magnet’s
.
Continue on page 565, Ch. 36.3 “The nature of a Magnetic Field” answer the following questions as
you read:
17. Every spinning
is a tiny
18. A pair of electrons spinning in the
pair of electrons spinning in
would their magnetic fields would
.
direction makes up a
magnet. A
directions, however, work against one another and
.
19. In which materials do the fields not cancel each other out?
Continue on page 566, Ch. 36.4 “Magnetic Domains” answer the following questions as you read:
20. Define Magnetic Domains:
21. Refer to Figure 36.8, copy the caption below:
22. What is the difference between a piece of ordinary iron and an iron magnet?
23. When a magnet is brought near a magnetic material, the domains are
.
24. Refer to the drawing in the upper portion of Figure 36.10. What is happening to the nails?
Continue on page 574, Ch. 36.9 “Earth’s Magnetic Field” answer the following questions as you read:
25. Why does a compass point north?
26. Do compasses point to true north? What is this discrepancy called?
27. The Earth acts like a strong
but it is not a magnetized chunk of iron.
28. How do most geologists think Earth creates its magnetic field?
stable. Evidence of this comes from analysis of the
29. The magnetic field of the Earth
magnetic properties of
. Iron atoms in a
state tend to align
. When the iron
, the direction
themselves with Earth’s
of Earth’s magnetic field is recorded by the orientation of the
in the rock.
30. More than
reversals have taken place in the past
million years. The most recent
years ago. We cannot predict when the next reversal will occur because
occurred
. Based on recent decreases of the Earth’s magnetic field in
the reversal sequence is
the last
years we may well have a magnetic field reversal within
years.