Physics- magnets and electromagnets

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What are the two ends of a permanent magnet called?

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Physics

47 Terms

1

What are the two ends of a permanent magnet called?

North and South poles.

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2

Forces

A push or a pull. repulsion/attraction

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3

Like poles of a magnet (N-N/S-S)

repel each other

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4

Unlike poles of a magnet (S-N/N-S)

Attract each other

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5

repel

to push away

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6

attract

to pull toward

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7

Magnetism

The force of attraction or repulsion of magnetic materials

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8

Electromagnetism

the interaction of electric currents or fields and magnetic fields.

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9

bar magnet

a magnet in the form of a bar with magnetic poles at each end

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10

horseshoe magnet

a type of magnet that has a bend in the middle

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11

magnetic field lines

show the direction of a magnetic field at different points.

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12

What happens if a magnet it cut in half?

It becomes two different magnets

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13

What does the compass indicate in field lines

The lines that run from north to south

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14

Why do magnetic field lines never cross?

Magnetic field lines never cross because they represent the direction of the magnetic force at any point in space.

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15

What happens if magnetic field lines did cross?

the magnetic force would be pointing in two different directions at the same point.

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16

magnetic materials

iron, cobalt, nickel, neodymium

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17

What must me remember when drawing field lines?

Arrows.

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18

Non-magnetic materials

Aluminium, gold, silver, copper

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19

What is a magnet?

A material that exerts a force onto another magnetic material

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20

exerts

puts energy or power into doing something

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21

magnetically hard

Can stay magnetic indefinitely like a bar or horseshoe magnet, producing a permanent magnet

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22

Magnetically soft

Soft materials such as pure iron, can be temporarily magnetised.

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23

What happens if a soft magnetic material is brought in contact with a hard magnetic material?

The magnet field will be induced.

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24

compasses

A compass is a device that tells you which way is north. It has a needle that is magnetized and can move freely.

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25

Where does the needle of a compass point towards

to the Earth's magnetic North Pole

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26

Induction

To create another magnetic field by bringing an opposite pole

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27

permanent magnet

A magnet that will keep its magnetic field indefinitely

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28

temporary magnet

An object that has an induced magnetic field for a short while.

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29

soft magnetic materials

Materials that are easy to magnetize and demagnetize.

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30

hard magnetic materials

A material that is difficult to induce keeping its field indefinitely.

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31

What happens when a current flows through a conductor?

It generates a magnetic field

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32

Unit for current

Amps, A

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33

current

The rate of flow of an electric charge

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34

How could we increase the an electromagnetic force?

Increasing the current ( electricity), increasing the wire length,

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35

What happens when you move a current away from the source of magnetism?

The magnetic strength decreases

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36

What does a loop in flow of current do?

It increases the strength of the field as the fields add together.

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37

Solenoid

a coil of wire with an electric current in it

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38

Why does a solenoid increase the magnetic field strength?

magnetic fields caused by the current in each turn of the coil add together to make a stronger overall magnetic field.

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39

What is the magnetic field of a solenoid similar to?

bar magnet

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40

How could we make the magnetic field of a solenoid stronger ?

By wrapping the solenoid in an iron core making an electromagnet

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41

How is are electromagnets made?

From a solenoid wrapped around iron core.

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42

Advantages of an electromagnet over a permanent magnet

We have more control over electromagnets . You can switch off an electromagnet and vary its current strength.

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43

Uniform field lines

When a magnetic field strength is equal across the whole field.

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44

how to create a uniform magnetic field with two bar magnets?

Placing the opposite poles of two magnets close to each other

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45

Core

soft iron metal which the solenoid is wrapped around

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46

Electromagnet

A non-permanent magnet turned on and off by controlling the current through it.

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47

How can we investigate magnetic fields

Using iron fillings or a plotting compass

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