Magnetic Properties
If a north pole of magnet is near a south pole of a magnet what happens?
They will attract to each other
True or False: A coil of wire carrying current creates a magnetic field?
True
List three types of fields affecting you right now
Elecric
Magnetic
Gravity
Sound
When current flows through a coil of wire, you have a(n):
Electromagnet
The rotating lement of a motor is referred to as the:
Armature
The spin of the electrons
How can a permanent magnet be demagnetized?
-dropping it on a hard surface
-heating it to a very high temperature
-forcing two north poles together
What is the unit used to measure the strength of a magnetic field?
Gauss
A simple electromagnetic device consisting of a coil with many turns is known as a:
Solenoid
The device that switches the polarity of the electromagnets giving motion to the roto in an electric motor is the
commutator
What happens to a magnets poles if it is cut in half?
Both pieces will have a north and south pole
The difference between true geopgraphic north and the "north" indicated by a compass is a difference measured in degrees and known as:
Declination
All of the following have a strong magnetic field EXCEPT:
a. Earth
b. Jupiter
c. Moon
d. The sun
The Moon
True or False: A solenoid and other coil electromagnets are used in batteries.
False
The purpose of a commutator in an electric motor is to
switch the electromagnets from north to south and back again
What type of material will have individual electrons combine to weakly oppose the field of a strong magnet?
Diamagnetic
The magnetic field is strongest for a straight wire carring electric current when it is ...
close to the wire
A device that uses electromagnetic induction to produce electricity is called a:
Generator
A motor's basic function is to convert _______ to ______.
electrical energy; mechanical energy
A generator is opposite of an electric motor (mechanical to electrical)
What material do the north and south pole atms rearranged so their magnetic fields cancel out?
Paramagnetic
Earth's magnetic north pole is aligned...
The magnetic field is strongest for a wire carrying electric current that has been looped into a coil:
Inside the coil or outside the coil?
Inside the coil
When does electromagnetic induction occur?
When current is induced in a wire by a moving magnet.
An electric generator produces:
Electrical energy