Download Magnetism guide 2

Berman
Cont. Physical Science
Chapter 21
Match the following definitions:
_____1) magnetic force
a) a device that converts mechanical energy into electrical
energy by rotating a coil of wire in a magnetic field.
_____2) magnetic pole
b) is the force a magnet exerts on another magnet, on iron,
a similar metal, or on moving charges.
_____3) magnetic field
c) a force associated with charged charged particles, which
has two aspects, electric force and magnetic force.
_____4) magnetic domain
d) a device that uses an electromagnet to turn and axle.
_____5) magnetosphere
e) a region that has a very large number of atoms with
aligned magnetic fields.
_____6) electromagnetic
force
g) a coil of current-carrying wire that produces a magnetic
field.
_____7) solenoid
h) the area surrounding Earth that is influenced by Earth’s
magnetic field.
_____8) electric motor
f) magnets have two of these, where the regions of the
magnet’s force is strongest.
_____9) electromagnetic field i) is the process of generating a current by moving a
current an electrical conductor relative to a magnetic field.
_____10) generator
j) surrounds a magnet and can exert magnetic
forces.
True or False; if the statement is false correct the statement to make it true.
__________ 1) Electric motors convert mechanical energy into electricity.
__________ 2) In a domain, all atoms are aligned so that their North poles face the same
way.
__________ 3) Iron, cobalt and steel cannot be made into magnets because their atoms
have weak magnetic fields.
__________4) Non-moving electric charges create a magnetic field.
__________5) Changing the current in a electromagnet controls the strength and
direction of its magnetic field.
__________6) Generators converts electricity into mechanical energy.
__________7) Like magnetic poles repel one another, and opposite magnetic poles attract
on another.
_________8) A magnetic field, which is strongest near the magnet’s middle, will either
attract or repel another magnet that enters the field.
_________9) The nearer the lines of force, the stronger the magnetic field.
_________10) Permanent magnets are easy to magnetize and loose their magnetism
easily.
_________11) When a magnet touches a magnetic substance, the substance becomes a
magnet.
_________12) A magnet cannot be made and destroyed over and over again.
Answer the following questions:
1). What is the difference between a motor and a generator?
2). What is the difference between a magnetic force and a magnetic field?
3). Describe what a solenoid is and draw a diagram of it.
4). How do you create a magnet by contact?
5). How do you create a magnet by stroking?
6). How can you make a magnet by induction?
7). What is the difference between a temporary and a permanent magnet?
8). What general statement can you write with regards to types of poles interacting and
whether attraction or repulsion takes place.
9). What are the three ways to destroy a magnet?
10). How do magnetic fields run? (North to South or South to North)