Con Phy Gilmore Ch 16-17

Front 1

A ________ is a materia that can create magnetic effects by itself.

Back 1

A magnet is a materia that can create magnetic effects by itself.

Front 2

A __________ magnet is a material that keeps its magnetic properites even when not near other magnets.

Back 2

A Permanent (hard) magnet is a material that keeps its magnetic properites even when not near other magnets.

Front 3

A magnet has how many poles?

Back 3

2 opposite poles ( Norht and South)

Front 4

A ________ is a materia that are affected by magnets but don't create magnetic effects by itself.

Back 4

A magnetic materials is a materia that are affected by magnets but don't create magnetic effects by itself.

Front 5

Like poles of a magnets _______.

Back 5

Repel

Front 6

Every magnet creates a what around it?

Back 6

Magnetic field

Front 7

Can you have a magnetic North pole without a South?

Back 7

No, magnets always have both.

Front 8

Why do magnetic field lines get farther apart the farther away you get from a magnetic?

Back 8

Because the force of the magnet gets weaker as the distance away from the magnet increases.

Front 9

What are magnets created by electrice current flowing in a wire?

Back 9

Electromagnets

Front 10

A field line must start at the ____ pole and end in the ____ Pole.

Back 10

A field line must start at the North pole and end in the South Pole.

Front 11

Unlike poles of a magnets __________.

Back 11

Attract

Front 12

Using the right hand rule, when your right hand fingers curl in the dirrection of the current in an electromagnet your thumb points where?

Back 12

North

Front 13

An advantage of an electromagnet is what?

Back 13

1. You can turn it on and off.
2. You can reverse south and north poles.
3.You can adjust the strength of it.

Front 14

What are the 2 ways to electromagnets stronger?

Back 14

1. Increase the current. (ex add a battery)
2. wrap the metal with more coils of wire.

Front 15

If you double the current on an electromagnet what happens to the strenght of the field?

Back 15

It also doubles

Front 16

Holding a magnet to lead or diamonds has no affect becasue theses materials arewhat kind of materials?

Back 16

Diamagnetic materials each atom has a net zero charges.

Front 17

What is a Paramagnetic material?

Back 17

In Paramagnetic materials the atoms have weak magnetic fields which aline up and become a magnetic only another magnet is near. (paperclip)

Front 18

What is true North?

Back 18

True North is where the Earth spins on it's axis.

Front 19

What is a ferromagnetic material?

Back 19

A smal group of metals that have strong magnetic properties. Ex. Iron, Nickle, and Cobalt

Front 20

What is the difference betweeen a soft and a hard magnet.

Back 20

Hard magnets also called permanent magnets) are hard to demagnatize. ex iron nickle
Soft magnets lose their magnitism easily, ex. steel.

Front 21

What can destoy magnetism?

Back 21

. High heat or A shock like a drop or Other magnets.

Front 22

Can a liquds or gases become permanent magnets?

Back 22

NO, because their atoms can't stay alined.

Front 23

Where is the earth's magnetic north?

Back 23

It is in the south with the penguins.

Front 24

Where is the earth's magnetic south?

Back 24

It is in the North withn Santa. West of Green Land

Front 25

What is magnetic declination?

Back 25

Magnetic Declalination is the differnce between Magnetic North and true North.

Front 26

What is the Earth magnetic core?

Back 26

The Earth magnetic core is the molten laver of the earth.

Front 27

What causes all magnitism?

Back 27

The movement of either electrons or protrons.

Front 28

What is in the earth core that allows it to have a magnetic field?

Back 28

Molten iron and nickle.

Front 29

What is the unit used to measure the strenght of a magnetic field?

Back 29

Gauss

Front 30

Does the Earth's and Sun's magnetic fields ever change?

Back 30

Yes, and the earth is over due for a North south flop.

Front 31

Magnetism is created by what?

Back 31

Moving Charges

Front 32

Explain the 2nd right hand rule.

Back 32

In a wire if you point your thumb in the direction of the current your fingers show the direction of the magnetic field.

Front 33

The strength of a magnetic field is directly porportional to what?

Back 33

The strength of a magnetic field is directly porportional to the amount of current.

Front 34

A solenoid is what?

Back 34

A solenoid is a long coil with many turns.

Front 35

A solenoid is used for what?

Back 35

A solenoid is used for consentrating magnetic fields. ex. electromagnets.

Front 36

The strength of a magnetic field is inversely porportional to what?

Back 36

The strength of a magnetic field is inversely porportional to the distance from the sire.

Front 37

What is a solenoid?

Back 37

An electrical coil with many turns.

Front 38

If you put a core in a solenoid what happens?

Back 38

If you put a core in a solenoid it greatly increases the strenght of the magnetic field.

Front 39

What happens when you double the number of wraps to a coil with current?

Back 39

When you double the number of wrops to a coil with a current the magnetic field also doubles.

Front 40

Why does a compas change direction when it is near a wire current?

Back 40

Because the current makes a magnetic field which it will line up with.

Front 41

In a motor what is a rotor?

Back 41

A Rotor is a rotating disk in a motor with perminent magnets on it alternating North south to south north.

Front 42

What is a commutator?

Back 42

A commutator in a motor is the device switches the electromagnets current in a motor to keep the rotor sping.

Front 43

Why is it eassier to make motors on AC current?

Back 43

Because AC current already alternates. They use electromagnets for both the rotating (Armature) and fixed magnets.

Front 44

What is an armature?

Back 44

An armature is the rotating part of a motor including the electromagnets.

Front 45

What are the 3 main parts of a n electric motor?

Back 45

1. Rotor,
2. one or more fixed magnets, 3. a commutator