Magnetism And Electromagnetism

Question 1

Magnetically hard materials

Answer 1

Are permanent magnets such as steel

Question 2

Magnetically soft materials

Answer 2

Lose their magnetism easily like iron

Question 3

Magnetic field

Answer 3

Volume of space where magnetism can be detected

Question 4

Flemings left hand rule tells you

Answer 4

Which way the force acts

Question 5

Motor effect

Answer 5

When a wire experiences a force pushing it from a stronger part of field to weaker part- stronger force if the magnetic field is stronger/current is increased

Question 6

Moving coil loudspeaker

Answer 6

Uses motor effect to turn electrical energy into sound energy

Question 7

Overlapping fields of coil and magnet

Answer 7

Creates rapidly varying forces on wires of coil

Question 8

To increase the rate at which the motor turns

Answer 8

1. Increase number of turns/loop of wire
2. Increase strength of magnetic field
3. Increase current

Question 9

Electromagnetic induction

Answer 9

It’s the creation of voltage in a wire which is experiencing a charge in the magnetic field

Question 10

Dynamo effect

Answer 10

1. Transform kinetic energy into electrical energy
2. Situations: electrical conductor moves through the magnetic field, magnetic field moves through an electrical conductor
3. Can test this by connecting an ammeter to a conductor moving through a magnetic field

Question 11

To get a higher voltage

Answer 11

1. Increase strength of magnet
2. Increase number of turns in the coil
3. Increase the speed of movement