Page
with the help of
demon Steate magnetic ferice?
an experiment.
Answers
Explanation:
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Answer:
Practice Problems
24.1 Magnets: Permanent and
Temporary
pages 643—651
If you hold a bar magnet in each hand and
bring your hands close together, will the
force be attractive or repulsive if the mag
nets are held in the following ways?
a. the two north poles are brought close
together
repulsive
b. a north pole and a south pole are
brought together
attractive
2. Figure 24-7 shows five disk magnets float
ing above each other. The north pole of the
top-most disk faces up. Which poles are on
the top side of each of the other magnets?
• Figure 24-7
south, north, south, north
3.
A magnet attracts a nail, whith, in turn, attracts
many small tacks, as shown in Figure 24-3 on
page 645. If the north pole of the permanent
magnet is the left end, as shown, which end
of the nail is the south pole?
the bottom (the point)
4. Why do magnetic compasses sometimes
give false readings?
because Earth’s magnetic field is dis
torted by objects made of iron, nickel, or
cobalt in the vicinity of the compass, and
by ore deposits of these same metals
A long, straight, current-carrying wire runs
from north to south.
a.
A compass needle placed above the wire
points with its nbrth pole toward the
east. In what direction is the current
flowing?
from south to north
b. If a compass is put underneath the wire,
in which direction will the compass
needle point?
west
6. How does the strength of a magnetic field,
1 cm from a current-carrying wire, compare
with each of the following?
a. the strength of the field that is 2 cm
from the wire
Because magnetic field strength
varies inversely with the distance
from the wire, the magnetic field at
1 cm will be twice as strong as the
magnetic field at 2 cm.
b. the strength of the field that is 3 cm
from the wire
Because magnetic field strength
varies inversely with the distance
from the wire, the magnetic field at
1 cm will be three times as strong as
the magnetic field at 3 cm.
page 647
1.
page 650
5.
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Physics: Principles and Problems Solutions Manual 485