Quiz #1- 9/24/20

a magnet that produces a magnetic field as the result of current flow in a conductor is called a(n)_______ magnet.

Electro

Magnetism can be explained in terms of _____ spin patterns.

Electron

Electrostatic charges occur on

Insulators

In a precipitator, the dust particles are given a charge. The polarity of the charge is

Positive

The strength of an electromagnet is primarily proportional to its

ampere-turns

The lightning damage prevention device that does not connect directly to the object to be protected is called the

arrestor

opposite magnetic poles

attract

if an object is placed in the field of an AC electromagnet and slowly moved away, the object will be

demagnetized

Magnetic lines of force are called

flux

the three substances that form natural magnets

iron, nickel, cobalt

Precipitator

is a type of air filter

to locate the north pole of an electromagnet, use the _____ hand rule

left

Loadstone is another name for natural magnets which are also called

lodestone, magnetite

Loadstone is a name for a naturally occurring magnetic material that is also called

magnetite

in the english system, the total force producing a magnetic field is the

magnetomotive force

If you walk across a carpet, tough a doorknob and get a shock, the shock was the result of a ______ static charge.

nuisance

A _________ magnet is a magnet that retains its magnetism without any applied power.

permanent

the measure of a materials willingness to be magnetized is called

permeability

the measure of a materials resistance to being magnetized is called

reluctance

Like magnetic poles

repel

when a magnetic materials molecules are all lined up, and increases in current flow no longer cause increases in magnetic field strength, the material is called

saturation

Electric charges that are not moving are called _______ charges.

static

the amount of magnetism left in a material after the magnetizing current has been removed is

residual magnetism

permanent magnets retain their magnetism

without any external power

A static electric charge is an electric charge which _______ moving.

is not