Magnetism

Question 1

Bar magnets are examples of ___ magnets

Answer 1

Permanent magnets

Question 2

Magnets are ____, which means they have two distinct and opposite ends

Answer 2

Polarized

Question 3

The reason magnets attract and repel each other are due to the ____ ____ around them

Answer 3

Magnetic fields

Question 4

Magnetic fields are strongest at the ___

Answer 4

Poles

Question 5

Field lines start at the ___ pole and end at the ___ pole

Answer 5

North Pole
South pole

Question 6

If you break a magnet in half the two halves will still be ___

Answer 6

Polarized

Question 7

____ - A group of neighboring atoms that have the magnetic fields of their electrons aligned in the same direction

Answer 7

Domain

Question 8

Magnetic materials have their domains aligned in the ___ direction

Answer 8

Same direction

Question 9

Non-magnetic materials have domains in ____ directions

Answer 9

Random

Question 10

Magnetic domains can be ___ to create a magnetized object by:
Placing the material in an external magnetic field
Rubbing the material w a magnet

Answer 10

Alligned

Question 11

Magnetic domains can be ___ to demagnetize through object by:
Dropping a magnet repeatedly
Heating a magnet

Answer 11

Unaligned

Question 12

____ - Describes the relationship between electricity and magnetism

Answer 12

Electromagnetism

Question 13

We use ____ to generate electricity, store memory on computers, generate pictures on tv’s, diagnose illnesses, etc

Answer 13

Electromagnets

Question 14

Electromagnetism works on the principle that moving charges (or currents) interact with and generate ____ ___

Answer 14

Magnetic fields

Question 15

When __ electricity is passed through a wire, a magnetic field rotates around the wire in a specific direction

Answer 15

DC electricity

Question 16

____ ___ ___ - If you take your right hand and wrap it around the wire, with your thumb pointing in the direction of the electrical current (positive to negative), then your fingers are pointing in the direction of the magnetic field around the wire

Answer 16

Right Hand Rule

Question 17

____ - A long coil of wire consisting of many loops

Answer 17

Solenoid

Question 18

The __ loops a solenoid has or the ____ the current through the wire, the stronger the magnetic field

Answer 18

More loops
Stronger the current

Question 19

In a ___ ____ the magnetic field runs from the north to the South Pole

Answer 19

Bar magnet

Question 20

In a ____, the magnetic field forms around the wire. If we wrap that wire around a metal object (core), we can often magnetize that object and concentrate the magnetic field

Answer 20

Wire

Question 21

Adding more loops, increasing the current or voltage, presence of a core = ____ magnetic field

Answer 21

Stronger magnetic field

Question 22

When a wire/conductor moves in a magnetic field, a ___ acts on the charges in the wire

Answer 22

Force

Question 23

___ is done on the charges, causing the electrons to move

Answer 23

Work

Question 24

___ magnetic fields can induce a current in a wire

Answer 24

Changing magnetic fields

Question 25

____ - Very sensitive ammeter, measures current

Answer 25

Galvanometer

Question 26

___ ___ - Is a measurement of the total magnetic field which passes through a given area.

Answer 26

Magnetic Flux

Question 27

For EM induction to occur; and the wire or the magnetic field needs to be moving or ___ in strength. This means ___ in magnetic flux

Answer 27

Changing
Changes

Question 28

___ ___ ___ - Induces a voltage, which then induces current. This allows us to make electricity without a power source

Answer 28

Changing magnetic field

Question 29

____ - Take electrical energy and convert it to mechanical energy using electromagnetism

Answer 29

Motors

Question 30

Motors use direct or alternating current to create a changing magnetic field through the wire loop that causes it to ___ when near another magnet

Answer 30

Spin

Question 31

___ - Take mechanical energy and convert it into electrical energy using electromagnetism

Answer 31

Generators

Question 32

Generators rely on the concept that changing magnetic fields will induce a ___ in a coil of wire

Answer 32

Current

Question 33

___ consists of a permanent magnet and an electromagnet (the armature/rotor)

Answer 33

Motor

Question 34

When ____ ___ runs through the wire, the armature becomes magnetized

Answer 34

Electric current

Question 35

The ___ end of the armature is attracted to the South Pole of the permanent magnet

Answer 35

North

Question 36

After half a turn, the direction of the current is ___ causing the poles on the electromagnet to reverse and rotation to occur

Answer 36

Reversed

Question 37

Generator
Electromagnetic induction
Producing __ by moving a magnet through a coil of wire

Answer 37

Current

Question 38

The induced current is ____ when the magnet was moved quickly

Answer 38

Larger

Question 39

How do you create an electromagnet?

Answer 39

Wrap a wire around a core (better if it’s metal), and running current through the wire

Question 40

How does a motor work?

Answer 40

Electrons flow through a loop of wire that is between two strong magnets, when charges move in loops they create their own magnetic field, the new magnetic field makes the loop rotate to align with the strong magnets it’s between, and the rotation of the loop causes the axle of the motor to turn

Question 41

Is voltage more or less important than the amount of coils?

Answer 41

More important

Question 42

If a loop of wire is being rotated by an EXTERNAL force, it is a __

Answer 42

Generator

Question 43

Generator produces (AC/DC)

Answer 43

Alternating current (AC)