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Magnetic field Domain Pole solenoid A Magnetic field The marked end of a compass needle always points directly to A earths geographic south pole B earths geographic

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Magnets Review The region around a magnet in which magnetic forces can act is called the: Transcript

Slide1

Magnets Review

Slide2

The region around a magnet in which magnetic forces can act is called the

Magnetic field

Domain

Pole

solenoid

Slide3

A)

Magnetic field

Slide4

The marked end of a compass needle always points directly to

A) earth’s geographic south pole

B) earth’s geographic north pole

C) magnet’s south pole

D)

magnet’s north pole

Slide5

B) earth’s geographic north pole

Slide6

What do you end up with if you cut a magnet in half?

One north-pole piece and one south-pole piece

two unmagnetized pieces

Two pieces, each with north and south pole

Two north pole pieces

Slide7

C) Two pieces, each with north and south pole

Slide8

Earth’s magnetic field

Is produced by a giant magnet at the center of the Earth

Is produced by movement of electric charges in Earth’s core

Does not change over time

Bends outward at the magnetic poles

Slide9

b)Is produced by movement of electric charges in Earth’s core

Slide10

Which of the following is NOT true about an electromagnet?

It can be strong enough to levitate a train

The current may be turned on or off

Its strength is reduced by adding more loops

It consists of an iron core and current-carrying wire

Slide11

c)Its strength is reduced by adding more loops

Slide12

Any material that attracts iron or materials containing iron is called

Solenoid

Magnet

Superconductor

semiconductor

Slide13

b) Magnet

Slide14

All magnets

a) have two poles

b) Exert forces

c) Are surrounded by a magnetic field

d) All of the above

Slide15

d) All of the above

Slide16

The magnetic effects of a bar magnet are

Evenly distributed throughout a magnet

Distributed randomly in a magnet

Concentrated near the ends

None of the above

Slide17

c) Concentrated near the ends

Slide18

Sometimes the magnetic strip on a credit card becomes demagnetized. The strip is most likely a

Permanent magnet

Temporary magnet

Electromagnet

geomagnet

Slide19

b)Temporary magnet

Slide20

If you attach a magnet to a string so that the magnet is

s

ee to rotate, you will see that one end of the magnet will point

North

Southwest

East

west

Slide21

a) North

Slide22

The Earth has neither an east pole nor west pole because

a)The earth is a sphere and has no poles

b) The earth is a sphere and has only one pole called an axis

c) The earth is like a bar magnet, which has two poles

d) None of the above

Slide23

c) The earth is like a bar magnet, which has two poles

Slide24

A compass needle is

A fixed magnet

A fixed nonmagnetic piece of metal

A magnet that is free to rotate

A nonmagnetic piece of metal that is free to rotate

Slide25

C)

A magnet that is free to rotate

Slide26

Magnetic poles always occur

Alone

In pairs

In threes

In fours

Slide27

B)

In pairs

Slide28

The magnetic force will pull magnets apart if you hold the

North poles of two magnets together

South poles of two magnets together

North pole of one magnet near the south pole of another magnet

Both A and B

Slide29

d)Both A and B

Slide30

The magnetic force will pull magnets together if you hold the

North poles of two magnets together

South poles of two magnets together

North pole of one magnet near the south pole of another magnet

Both A and B

Slide31

C)

North pole of one magnet near the south pole of another magnet

Slide32

Magnetic poles are similar to electric charges in that

Like poles repels and opposite poles attract

The magnetic force is equal to the electric force

The number of magnetic domains responsible for the poles is conserved.

The mass of magnetized particle is conserved

Slide33

A)

Like poles repels and opposite poles attract

Slide34

The magnetic field around a bar magnet can be modeled by drawing

Curved lines from the north pole of the magnet to the south pole

Curved lines near the south pole of the magnet

Straight lines from the north pole and from the south pole

Circular lines around the entire magnet

Slide35

A)

Curved lines from the north pole of the magnet to the south pole

Slide36

Whether a material is magnetic depends on _____ in the material

Molecules

Atoms

Number of neutrons

Number of protons

Slide37

B)

Atoms

Slide38

A magnet can be demagnetize if

a) it is dropped

b) it is heated

c)it is stuck very hard

d) all of the above

Slide39

d) all of the above

Slide40

A magnet, usually within an iron core, produced by an electric current is

Electromagnet

Ferromagnet

Temporary magnet

Permanent magnet

Slide41

A)

Electromagnet

Slide42

Turbines generally turn the _______ in a generator, inducing an electric current

Transformer

Magnet

Wire loop

solenoid

Slide43

B)

Magnet

Slide44

Which of the following is currently being used to turn turbines in generators?

a) steam

b) water

c) wind

d) all of the above

Slide45

d) all of the above

Slide46

The interaction between electricity and magnetism is called

a) electromagnetism

b) Electromagnetic induction

Slide47

a) electromagnetism

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