Electromagnetism

Question 1

The study of the relationship between electricity and magnets

Answer 1

Electromagnetism

Question 2

The interaction of electric charges.

Answer 2

Electricity

Question 3

____ are a fundamental property of protons and electrons, the particles which make up every atom.

Answer 3

Electric charges

Question 4

Types of electric charges

Answer 4

• Positive
• Negative

Question 5

What type of charge do protons possess?

Answer 5

Positive charge

Question 6

What type of charge do electrons carry?

Answer 6

Negative charge

Question 7

What happens when electric charges move?

Answer 7

They create an electric current.

Question 8

Law of electric charges

Answer 8

Like charges repel, while unlike charges attract.

Question 9

Concept of Coulomb’s Law

Answer 9

The size of charges and the distance between them are both key factors in determining the strength of the electric force between charged objects.

Question 10

The force of attraction or repulsion between objects.

Answer 10

Magnetism

Question 11

Invisible areas of attraction or repulsion around magnetic materials and currents.

Answer 11

Magnetic fields

Question 12

The force exerted by magnets on certain materials or on other magnets.

Answer 12

Magnetic force

Question 13

The two poles of a magnet

Answer 13

• North
• South

Question 14

What happens when like poles of magnets are brought together?

Answer 14

They repel each other.

Law of electric charges

Question 15

What happens when opposite poles of magnets are brought together?

Answer 15

They attract each other.

Law of electric charges

Question 16

What can magnetism create?

Answer 16

Electricity

Question 17

What can electricity produce?

Answer 17

Magnetism

Question 18

Fill in the blank: _______ is produced when charges from one piece of matter interact with those from another piece.

Answer 18

Both electric and magnetic forces

Question 19

Objects that generate a magnetic field

Answer 19

Magnets

Question 20

Materials that allow an electric current to flow through them easily.

Answer 20

Conductors

Examples:
* Metals (copper, aluminum, silver, gold)
* Water (contains dissolved salts)
* Human body

Question 21

Materials that resist the flow of electric current.

Answer 21

Insulators

Examples:
* Rubber
* Glass
* Plastic
* Air
* Paper

Question 22

Where is the magnetic field strongest?

Answer 22

At the poles of a magnet.

Question 23

The 2 types of magnets

Answer 23

• Permanent magnets
• Electromagnets (Temporary)

Question 24

This type of magnet produces a continuous magnetic field and does not require electricity.

Answer 24

Permanent magnet

Examples:
* Fridge
* Bar Magnets

Question 25

This type of magnet requires an electric current to generate a magnetic field and can be turned on or off.

Answer 25

Electromagnet ## Footnote Examples: * Magnetic cranes * MRI machines * Electric bells

Question 26

The physicist who first discovered that an electric current produces a magnetic field around a wire

Answer 26

Hans Christian Oersted.

Question 27

What happens when an electric current flows through a wire?

Answer 27

It creates a magnetic field around the wire.

Question 28

Wrapping a wire with an electric current into a coil does what to the magnetic effect?

Answer 28

Amplifies

Question 29

What strengthens the magnetic field when placed inside a coil?

Answer 29

An iron core.

Question 30

How does current strength affect an electromagnet?

Answer 30

Higher current **increases the magnet's power**.

Question 31

The number of ____ influences electromagnet strength

Answer 31

Number of coils.

Question 32

What type of core material enhances magnetism best?

Answer 32

Iron cores.

Question 33

Fill in the blank: An electromagnet is a type of magnet created by passing an electric current through a _______.

Answer 33

Wire coil.

Question 34

What factors affect the strength of an electromagnet?

Answer 34

* Number of turns * Current * Core material * Coil size * Distance * Temperature