Chapter 11 Terms

Question 1

Any object that possesses or can generate a magnetic field.

Answer 1

Magnet

Question 2

One of the areas of concentrated magnetic field lines on a magnet’s surface.

Answer 2

Magnetic pole

Question 3

Any object or particle with magnetic properties

Answer 3

Magnetic dipole

Question 4

The region of influence surrounding a magnet.

Answer 4

Magnetic field

Question 5

Law stating that opposite magnetic poles attract and like magnetic poles repel.

Answer 5

Law of magnetism

Question 6

A form of magnetism that results from the net difference of a mixture of opposed magnetic dipole particles in a natural magnet.

Answer 6

Ferrimagnetism

Question 7

Natural tendency of all matter to weaken a magnetic field, especially in the absence of other kinds of magnetism.

Answer 7

Diamagnetism

Question 8

Exhibited by materials that are only slightly attached to magnets.

Answer 8

Paramagnetism

Question 9

A microscopic region of a metal where most of the magnetic dipoles are oriented in a single direction.

Answer 9

Domain (magnetic)

Question 10

A ferromagnetic material containing enogh aligned magnetic domains to give it a permanent magnetic character.

Answer 10

Permanent magnet.

Question 11

Phenomenon observed in materials that are highly permeable to magnetic lines of force because their magnetic domains align with the field.

Answer 11

Ferromagnetism

Question 12

Temperature above which a permanent magnet loses its ferromagnetic properties.

Answer 12

Curie temperature

Question 13

Point representing the intersection of the earth’s axis with its surface in the northern hemisphere.

Answer 13

Geographic north pole

Question 14

Slowly drifting point on the earth’s surface in the northern hemisphere.

Answer 14

Magnetic north pole

Question 15

Magnetic field of the earth.

Answer 15

Geomagnetic field

Question 16

Rule stating that the direction of the magnetic field surrounding a current carrying conductor is indicated by the direction the fingers wrap around the conductor.

Answer 16

Right-hand rule of magnetism

Question 17

Electromagnetic device consisting of a cylinder formed by many wraps of wire.

Answer 17

Solenoid

Question 18

Solenoid with a ferromagnetic core

Answer 18

Electromagnet

Question 19

Electricity generated from a charging magnetic field or a magnetic field generated by an electrical current.

Answer 19

Electromagnetic induction

Question 20

Part of an electrical motor or generator that rotates.

Answer 20

Rotor

Question 21

Stationary part of an electrical motor or generator that contains the magnets or induction coils that surround the rotor.

Answer 21

Stator

Question 22

Electrical current that periodically changes direction at a specific frequency

Answer 22

Alternating current

Question 23

SI unit of frequency

Answer 23

Hertz

Question 24

Mechanical device that converts fluid motion into rotary motion as the fluid passes through propeller-like blades

Answer 24

Turbine

Question 25

Device that converts the alternating current inside a DC generator to a DC output or converts a DC supply to alternating current inside a DC motor.

Answer 25

Commutator

Question 26

One of the many curved blocks of conductive material that ride on a rotor commutator to connect the rotor coils to the external electrical circuit.

Answer 26

Brush (electrical)

Question 27

A machine that converts electrical energy into rotational mechanical motion

Answer 27

Motor

Question 28

An electrical device used in AC circuits consisting of two coils of wire wound on a single ferromagnetic core.

Answer 28

Transformer

Question 29

Electromagnet made of a material that has zero resistance to current flow.

Answer 29

Superconducting magnet