Abeka 9th Science Quiz 21 L99

A permanent magnet is made from a magnetically ______ material.

• fluffy

• soft

• hard

• liquid

How strongly the magnetic force acts through a material is determined by the material's _________.

• permeability

• thermal resistance
• electrical conductivity
• flux linkage

The principle that relates the force between two magnets is the ___________.

• theory of relativity
• principle of inertia
• law of magnetic force

• law of gravity

The most important cause of magnetism in magnetic materials is __________.

• electron charge distribution
• magnetic field strength
• temperature fluctuations
• electron spin

The form of the mineral magnetite used since ancient times as a natural compass is ________.

• lodestone
• pyrite
• hematite
• quartz

The direction and strength of a magnetic field is indicated by imaginary lines called ________.

• lines of flux

• magnetic field lines
• electric field lines
• gravitational field lines

Regions of concentrated magnetism are called _______.

• magnetic poles
• magnetosphere
• electromagnetic waves
• magnetic fields

Diamond, which lacks unpaired electrons and is slightly repelled by either pole of a magnet, is a(n) ________ substance.

• paramagnetic
• ferromagnetic
• superparamagnetic
• diamagnetic

Aluminum, which has one unpaired electron and is slightly attracted by either pole of a magnet, is a(n) _________ substance.

• paramagnetic
• ferromagnetic
• diamagnetic
• non-magnetic

A group of aligned atoms with one magnetic field is a(n) __________.

• magnetic field
• paramagnetic material
• domain

• ferromagnet