MAGNETISM AND MAGNETIC FORCES

studied byStudied by 4 people
0.0(0)
Get a hint
Hint

Magnetism

1 / 30

flashcard set

Earn XP

31 Terms

1

Magnetism

What is the property of attracting objects made of iron, nickel, and cobalt?

New cards
2

Magnetic Fields

The region around a magnet where a force acts on another magnet or magnetic material.

New cards
3

attract

The Rules of Magnetism state that opposite magnetic poles __________ each other, while like magnetic poles repel each other.

New cards
4

Magnetic Forces

These are non-contact forces–this means that magnets affect each other without touching.

New cards
5

Iron, steel, nickel and cobalt

Give one example of a magnetic material.

New cards
6

Permanent Magnets

Magnets made from materials like iron that always produce a magnetic field.

New cards
7

Key features of a permanent magnet

These include its ability to generate a magnetic field without the need for an external power source, and its capacity to retain its magnetism over a long period of time.

New cards
8

Induced Magnets

Materials that become magnets only when placed in a magnetic field and lose magnetism when removed.

New cards
9

Magnetic

Testing for magnetism involves using a compass to detect the presence of a magnetic field. If the compass needle aligns with the direction of the magnetic field, the object is considered to be _________.

New cards
10

Magnetic Field

It is the region around a magnet where a force acts on another magnet or on a magnetic material.

New cards
11

Magnetic Compass

A tool with a bar magnet that aligns with Earth's magnetic field or a magnet's field.

New cards
12

Solenoid

This consists of a wire coiled up into a spiral shape.

New cards
13

Motor Effect

Interaction between a wire carrying current and a magnetic field, causing a force on the wire.

New cards
14

Motor Effect

The ___________ is the phenomenon where a current-carrying conductor in a magnetic field experiences a force perpendicular to both the field and the current direction.

New cards
15

Fleming’s Left-hand Rule

Rule to determine the direction of the force on a wire in a magnetic field.

New cards
16

Force on a conductor (at right angles to a magnetic field) carrying a current = magnetic flux density Ă— current Ă— length

The equation for calculating electric force.

New cards
17

Electric Motors

A coil of wire carrying a current in a magnetic field experiences a force that tends to make it rotate.

New cards
18

AC Motor

A(n) __________ is an electric motor that operates on alternating current, changing direction periodically to produce rotational motion.

New cards
19

DC Motor

A device that converts electrical energy into mechanical energy through the interaction of a magnetic field and electric current.

New cards
20

Loudspeakers

In these devices, variations in an electric current cause variations in the magnetic field produced by an electromagnet. This causes a cone to move, which creates pressure variations in the air and forms sound waves.

New cards
21

Electromagnetic Induction

Creation of a potential difference in a conductor due to movement in a magnetic field.

New cards
22

Electric Potential

Potential Difference is the difference in __________ between two points in an electric circuit, representing the energy transferred per unit charge.

New cards
23

Magnetic Flux

Factors affecting the induced potential include the rate of change of ____, the number of turns in the coil, and the strength of the magnetic field.

New cards
24

Electromagnetic Induction

A potential difference can be induced (created) in a conductor when there is movement between the conductor and a magnetic field.

New cards
25

Alternators

Devices producing alternating current by rotating a coil in a magnetic field.

New cards
26

Dynamos

Devices generating direct current by rotating a coil in a magnetic field with a split ring commutator.

New cards
27

Half

In a dynamo, a split ring commutator changes the coil connections every ____ turn.

New cards
28

Microphone

A device that converts sound waves into electrical signals.

New cards
29

Transformers

Devices changing the potential difference of alternating current using two coils and an iron core.

New cards
30

Step-up transformer

A transformer where the potential difference in the secondary coil is higher than in the primary coil.

New cards
31

Step-down transformer

A transformer where the potential difference in the primary coil is higher than in the secondary coil.

New cards

Explore top notes

note Note
studied byStudied by 60 people
Updated ... ago
5.0 Stars(3)
note Note
studied byStudied by 5 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 34 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 18 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 8 people
Updated ... ago
4.5 Stars(2)
note Note
studied byStudied by 31 people
Updated ... ago
5.0 Stars(2)
note Note
studied byStudied by 225 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 38 people
Updated ... ago
5.0 Stars(1)

Explore top flashcards

flashcards Flashcard46 terms
studied byStudied by 7 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard89 terms
studied byStudied by 24 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard46 terms
studied byStudied by 2 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard36 terms
studied byStudied by 4 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard47 terms
studied byStudied by 16 people
Updated ... ago
5.0 Stars(3)
flashcards Flashcard20 terms
studied byStudied by 12 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard67 terms
studied byStudied by 177 people
Updated ... ago
5.0 Stars(4)
flashcards Flashcard31 terms
studied byStudied by 3 people
Updated ... ago
5.0 Stars(1)