quiz

Question 1

, it has the ability to exert forces on magnets or other magnetic materials.

Answer 1

magnetic

Question 2

is a material that keeps its magnetic properties even when it is NOT close to other magnets.

Answer 2

permanent magnet

Question 3

two opposite poles of magnet

Answer 3

north and south pole

Question 4

Magnets exert forces of each other

The forces depend on the alignment of the poles

Answer 4

read

Question 5

Plastics, wood, and most insulating materials are virtually transparent to magnetic forces.

Answer 5

read

Question 6

Conducting metals, like aluminum, also allow magnetic forces to pass through, but may change the forces.

Answer 6

read

Question 7

The strength of the force between magnets depends on the distance between them.

The magnetic force decreases with distance much faster than does either gravity or the electric force.

Answer 7

read

Question 8

All magnets create a magnetic field in the space around them, and the magnetic field creates forces on other magnets.

Answer 8

read

Question 9

The number of field lines in a certain area indicates the relative strength of the magnetic field in that area.
The arrows on the field lines indicate the direction of the force.
The closer the lines are together, the stronger the field.
Magnetic field lines always point away from a magnet’s north pole and toward its south pole

Answer 9

magnetic field

Question 10

The sources of nearly all magnetic effects in matter are the electrons in atoms.
There are two ways in which electrons create magnetism:
Electrons around the nucleus and their motion makes the entire atom a small magnet.
Electrons themselves act as though they were magnets.

Answer 10

read

Question 11

All atoms have electrons, so you might think that all materials should be magnetic, but there is great variability in the magnetic properties of materials.
The electrons in some atoms align to cancel out one another’s magnetic influence.
While all materials show some kind of magnetic effect, the magnetism in most materials is too weak to detect without highly sensitive instruments.

Answer 11

read

Question 12

, the electrons are oriented so their individual magnetic fields cancel each other out.

Answer 12

diamagnetic materials

Question 13

Individual atoms in _______ materials are magnetic but the atoms themselves are randomly arranged so the overall magnetism of a sample is zero.

Answer 13

paramagnetic

Question 14

A small group of metals have very strong magnetic properties, including iron, nickel, and cobalt.
These metals are the best known examples of _______ materials.

Answer 14

ferromagmetic

Question 15

Magnetic Properties of Materials
A small group of metals have very strong magnetic properties, including iron, nickel, and cobalt.
These metals are the best known examples of ferromagnetic materials.
Atoms with similar magnetic orientations line up with neighboring atoms in groups called _____________

Answer 15

magnetic domains

Question 16

Magnetic Properties of Materials
Magnetic domains in a ferromagnetic material will always orient themselves to attract a permanent magnet.
If a north pole approaches, domains grow that have south poles facing out.
If a south pole approaches, domains grow that have north poles facing out.

Answer 16

read

Question 17

Materials that make good permanent magnets are called _____ magnets

Answer 17

hard

Steel, which contains iron and carbon, is a common and inexpensive material used to create hard magnets.

Question 18

Materials that lose their magnetism quickly are called ____magnets

Answer 18

soft

Question 19

The Earth’s Magnetic Field
As early as 500 B.C. people discovered that some naturally occurring materials— such as lodestone and magnetite—have magnetic properties.
By 1200, explorers from Italy were using a compass to guide ocean voyages beyond the sight of land.

Answer 19

read

Question 20

The Earth’s Magnetic Field
When you use a compass, the north-pointing end of the needle points toward a spot near (but not exactly at) the Earth’s geographic north pole.
The Earth’s magnetic poles are defined by the planet’s magnetic field.
That means the south magnetic pole of the planet is near the north geographic pole.

Answer 20

read

Question 21

what is a magnet

Answer 21

What is a magnet?
A magnet will pull some metals towards itself.
Metals that contain iron, nickel, and cobalt are magnetic. In other words, a magnet will pull them.

Question 22

ability of a magnet to attract another object.

Answer 22

magnetism

Question 23

The region where the magnetic forces

act is called

Answer 23

magnetic field

Question 24

Every magnet has at least one north pole and one south pole. (magnetic field lines leave the North end of a magnet and enter the South end of a magnet)

If you take a bar magnet and break it into two pieces, each piece will again have a North pole and a South pole.

Answer 24

read

Question 25

A temporary magnet made by passing electric current through a wire coiled around an iron bar.

Answer 25

electromagnet

Question 26

consists of an iron core placed inside a wire coil. The magnetic field strength of a wire coil carrying an electric current increases in direct proportion to the number of turns of the coil.

Answer 26

electromagnet

Question 27

discovered the deflection of a compass needle while performing a demonstration for his students
discovered the fundamental connection between electricity and magnetism

Answer 27

Hans Christian Oersted

Question 28

A current-carrying wire becomes a magnet by setting up a magnetic field around it.

Our proof for this is the deflection of the compass needle.

Answer 28

read

Question 29

According to Oersted’s experiment…

Answer 29

A current-carrying wire produces a magnetic field .
successfully connected electricity and magnetism
aligned a straight wire with a compass pointing to Earth’s magnetic north
when current is present, the needle deflects perpendicular to the wire
when the current is reversed, the needle deflects in the opposite direction

Question 30

Oersted’s principle

Answer 30

“a charge moving through a straight conductor produces a circular magnetic field around the conductor”

Question 31

Remember: electric current from + to the – terminal of the battery

Answer 31

Right hand grip rule

Question 32

Current is coming out of the paper.

Answer 32

Counter-clockwise!

Question 33

If the current through the wire increases, the strength of the induced magnetic field increases.

Answer 33

read

Question 34

a long coil of several turns of wire

Answer 34

solenoid

Question 35

The magnetic field inside a solenoid is stronger than the magnetic field outside it.
The concept of solenoid led to the creation of a simple electromagnet.

Answer 35

read

Question 36

If the number of coils in a wire increases, the strength of the induced magnetic field increases.

Answer 36

read

Question 37

invented electric motor, generator and transformers
discovered electromagnetic induction
discovered laws of electrolysis

Answer 37

Michael Faraday

Question 38

Faraday’s conclusion

Answer 38

An electrical current is produced by a changing magnetic field

The discovery of Faraday paved the way to the development of the generator, transformer and other devices that made the production of electricity cheaper.

Question 39

It converts mechanical energy to electrical energy.

Answer 39

generator

Question 40

flows in one direction.

Answer 40

direct current

Question 41

current that flows in a back-and-forth manner

Answer 41

alternating current

Question 42

A device that transforms electrical energy to mechanical energy.

Answer 42

motor

Question 43

A device that transforms mechanical energy to electrical energy.

Answer 43

generator