Magnetism

When current flows threw a wire,

a magnet field is created around the wire

Ferromagnetic materials are

metals that are easily magnetized. Iron, nickel, cobalt, and manganese

Paramagnetic materials are

metals that can be magnetized, but not as easily as ferromagnetic materials. Platinum, titanium, and chromium

Static charges are sometimes called:

A nuisance. Examples: Cars as they move through dry air, Accumulated on a person's body as they walk across carpet, accumulates on clothes in dryer

If a Permanent magnet is cut into pieces, each piece is:

A separate magnet

The strength of an electromagnet is primarily proportional to its

Ampere turns

If an object is place in the field of a strong electromagnet connected to an AC line, the object will

Be Demagnetized

The three ways to demagnetize an object are

By placing it in an AC magnetic field and pulling it away, by striking it, by heating it

What type of magnet depends on flowing current to produce a magnetic field?

Electromagnet

True or False - The north pole of a compass needle points in the direction of the south geographic pole

False

The three basic types of magnetic material are:

Ferromagnetic, Paramagnetic, Diamagnetic

Magnetic lines of force are called?

Flux

Magnetic lines of force are referred to as

Flux

Magnetic strength is measured in terms of

Flux density

The magnetic poles of the earth and the axes poles are

Not the same

What type of magnet do not require any power or force to maintain their field?

Permanent Magnet

The strength of the electromagnet is determined by:

The ampere-turns

The angular difference between true north and magnetic north is known as the

angle of Declination

Diamagnetic materials

are either metal or nonmetal materials that cannot be magnetized. The magnetic lines of force go around them instead of through them. Copper, brass, and antimony

Static means:

not moving or sitting still

The north magnetic pole of a compass needle is attracted to

the South magnetic pole of the earth

Flux density is

the number of magnetic lines contained in a certain area.

The direction of current flow through the wire determines

the polarity of the magnetic field

The basic law of magnetism states

unlike poles attack, like poles repel

Early natural magnets were known as

Lodestones

The measure of the materials ability to be magnetized is

Permeability

True or False - Earth contains magnetic poles

True

The lines of flux

repel each other and never cross

What are the three different systems used to measure magnetic values:

The English system, The CGS system, The SI System

Man-made magnets

retain their magnetism longer

Magnetism can be explained in terms of

Electron spin patterns

The type of core material used in an electromagnet can:

increase its strength