chapter 11

Question 0

regions where attractive and repulsive properties are concentrated

Answer 0

2.magnetic poles

Question 1

object capable of attracting iron or steel objects by magnetic force

Answer 1

1.magnets

Question 2

object or particle with magnetic properties

Answer 2

3.magnetic dipoles

Question 3

region of influence surrounding a magnet

Answer 3

4.magnetic field

Question 4

law stating that opposite magnetic poles attract and like magnetic poles repel

Answer 4

5.law of magnetism

Question 5

phenomenon observed materials that are highly permeable to magnetic lines of force

Answer 5

6.ferromagnetism

Question 6

exhibited by materials that are only slightly attracted to magnets

Answer 6

7.paramagnetism

Question 7

microscopic region of a metal where most of the magnetic poles are oriented in a single direction

Answer 7

8.domain

Question 8

ferromagnetic material containing enough magnetic domains to give it a permanent magnetic character

Answer 8

9.permanent magnet

Question 9

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

Answer 9

10.ferrimagetism

Question 10

natural tendency of all matter to weaken a magnetic field

Answer 10

11.diamagnetism

Question 11

temperature above which a permanent magnet loses its ferromagnetic properties

Answer 11

12.Curie temperature

Question 12

point representing the intersection of the earth’s axis with its surface in the north hemisphere

Answer 12

13.geographic North pole

Question 13

slowly drifting point on the earth’s surface in the northern hemisphere where the earth’s magnetic field lines are most concentrated and nearly vertical as they pass into the earth’s pole

Answer 13

14.magnetic North Pole

Question 14

magnetic field of the earth

Answer 14

15.geomagnetic field

Question 15

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 if it is grasped with the right hand, the thumb pointing in the direction of the conventional current flow.

Answer 15

16.right - hand rule of magnetism

Question 16

An electromagnetic device consisting of a cylinder formed by many wraps of wire. When carrying a current, a strong magnetic field forms within the cylinder of wire. If it contains an iron core, it is a ferromagnetic solenoid, or electromagnet.

Answer 16

17.solenoid

Question 17

A solenoid with a ferromagnetic core.

Answer 17

18.electromagnet

Question 18

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

Answer 18

19.electromagnetic induction

Question 19

Part of an electrical motor or generator that rotates. Depending on the application, it may include permanent magnets or electromagnets.

Answer 19

20.rotor

Question 20

The stationary part of an electrical motor or generator that contains the magnets or induction coils that surround the rotor

Answer 20

21.stator

Question 21

An electrical current that periodically changes direction at a specific frequency. In the United States, that frequency is 60 Hz.

Answer 21

22.alternating current

Question 22

The SI unit of frequency; 1 Hz = 1 cycle/s, sometimes represented by s–1.

Answer 22

23.hertz

Question 23

Any mechanical device that converts fluid motion into rotary motion as the fluid passes through propeller-like blades.

Answer 23

24.turbine

Question 24

A device that converts the alternating current inside a DC generator to a DC output or converts a DC supply to an alternating current inside a DC motor. It consists of segments of metal mounted on the rotor shaft and connected to the individual coils mounted on the rotor of the machine.

Answer 24

25.commutator

Question 25

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 25

26.brush ( electrical )

Question 26

A machine that converts electrical energy into rotational mechanical motion.

Answer 26

27.motor

Question 27

An electrical device used in AC circuits consisting of two coils of wire wound on a single ferromagnetic core, usually shaped like a hollow square. A transformer can either raise or lower the voltage in an AC circuit compared to that supplied by another circuit or isolate one AC circuit from another.

Answer 27

28.transformer

Question 28

An electromagnet made of a material that has zero resistance to current flow, usually at temperatures very close to absolute zero.

Answer 28

29.superconducting magnet