Magnetism (Unit 4)

Milliampere

1/1000 of an ampere

1 ounce

27,800 ounce

Core Material

A base material called the?

Magnetic domains

A group of atoms whose magnetic fields are aligned

Permanent Magnet

A magnet that do not require any power or force to maintain their field.

Ferromagnetic Material

A material that is strongly attracted to a magnet, and which can be made into a magnet.

Flux Density

A measure of the density of the field lines around a magnet

Magnetic Domains

A section within a magnetic material where atoms are aligned to produce a north or south polarity

Diamagnetic Material

Are materials either metal or nonmetal that CANNOT be magnetized. The magnetic lines of force tend to go around them instead through them. Ex. Copper, Brass, Antimony, and Aluminum.

Paramagnetic Material

Are materials that CAN be magnetized, but not as easily as the Ferromagnetic materials.

Magnetic Polarity

Direction of the Earth's magnetic field

Coercive Force

It is a measure of a material's ability to retain magnetism. Is measured by determining the amount of current flow through the coil in the opposite direction that is required to remove the residual magnetism.

Ampere-turn

It is use determine by multiplying the number of turns of wire by the current flow.

Magnetic Flux

Its the number of magnetic field lines passing through a surface

Lines of flux

Lines of magnetic force

Demagnetize

Pulling it away, striking and by heating can cause the magnet to?

Natural Magnet

Rocks that attract iron, nickel, or cobalt. Example is magnetite from the one called lodestone.

Residual Magnetism

The amount of magnetism left in a material after the magnetizing force has stopped is called?

Angle of Declination

The angular difference between True north pole and true south pole is known as?

Unlike poles attract and like poles Repel

The basic law of magnetism

Lodestones

The earliest known natural magnets that aligned itself north and south.

Magnetomotive Force

The force that produces magnetic lines of flux in a circuit as a result of current in a conductor. The term used to describe the total force producing a magnetic field, or flux, is?

Impedance

The total opposition to current flow in a electric circuit. (Z)

Electromagnets

They are generally designed to produce a magnetic field only as long as the current is flowing; they do not retain their magnetism when the current flow stops.

Coils

This material can be wound around any material to form an electromagnet.

Iron Core Magnet

When a coil is wound around a nonmagnetic material such as iron or soft steel, it is known as an?

Air Core Magnet

When a coil is wound around a nonmagnetic material such as wood or plastic, it is know as an?

Magnetic Field

Whenever an electric current flows through a conductor, a __________is formed around the conductor.

Left hand rule

Which rule is used to determine electron flow?

Precipitators

devices that employ static electric charges to help capture and remove small particles from the air.

Permeability

is a measure of a materials ability to become magnetized

Reluctance

is the resistance to magnetism

Saturation

the state or process that occurs when no more of something can be absorbed, combined with, or added.