P4

Question 1

Magnetic field

Answer 1

Space around magnetic where another magnetic material experiences a force

Question 2

Permanent magnets materials

Answer 2

Iron. Nickel. Cobalt. Alloys( steel)

Question 3

What happens when you hit a magnet with hammer

Answer 3

It will lose its magnetism

Question 4

You can magnetise the material by doing what with another permanent magnet?

Answer 4

Stroking it

Question 5

Before the magnetism, the domains point in

Answer 5

random directions

Question 6

After magnetism , the domains point in

Answer 6

The same direction

Question 7

A permanent magnet produces its own

Answer 7

Magnetic field

Question 8

An induced magnet is a

Answer 8

Material that becomes magnetic when placed under magnetic field

Question 9

What force does induced magnetism cause

Answer 9

Forces of attraction

Question 10

When removed from the magnetic field an induced magnet will

Answer 10

Lose most or all of its magnetism quickly

Question 11

Where is a magnetic field the strongest in a permanent magnet

Answer 11

The poles

Question 12

A alternating potential difference is

Answer 12

Potential difference that constantly changes direction

Question 13

Alternator

Answer 13

Generator that produced an alternating potential difference

Question 14

Compass is a

Answer 14

Small magnet that aligns in the earths magnetic field to show its direction

Question 15

Diaphragm is the

Answer 15

Part of mic/loudspeaker that moves (when a sound hits it or to produce a sound wave)

Question 16

Domain is

Answer 16

Model of a magnet that says it is made of small magnetic regions

Question 17

Dynamo

Answer 17

A generator which produces a direct potential difference

Question 18

Electromagnetic induction is

Answer 18

The process of producing a induced potential difference in a conductor due to the conductor cutting magnetic field lines

Question 19

Compasses always post by towards the

Answer 19

Earths North Pole

Question 20

A current flowing through a wire creates

Answer 20

a magnetic field around the wire

Question 21

The shape of a current flowing through a wire is

Answer 21

Concentric circles

Question 22

Distance vs magnetic field strength graph

Answer 22

As you move away from the wire the magnetic field falls non linearly

Question 23

As you move away from the wire, the magnetic field falls quickly at first and then

Answer 23

Falls more slowly

Question 24

A larger current will give a

Answer 24

Stronger magnetic field

Question 25

In the right hand grip rule, the thumb is the

Answer 25

Current direction

Question 26

In the right hand grip rule, the fingers are the

Answer 26

Magnetic field direction

Question 27

The magnetic field for a solenoid is like a

Answer 27

Bar magnet

Question 28

To increase a solenoid magnetic field you

Answer 28

Increase current. Increase turns. Place iron core inside solenoid

Question 29

A solenoid is

Answer 29

Lots of cool around wire

Question 30

Frequency is

Answer 30

The number of waves per second

Question 31

Induced potential difference is the

Answer 31

Potential difference produced across a conductor that is cutting magnetic field lines

Question 32

Loud speaker

Answer 32

Produces sound wave cuz a force exerted on a cone (arises from magnetic field due to coil and permanent magnet )

Question 33

Microphone

Answer 33

Converts sound wave into electrical signal

Question 34

What is the motor effect

Answer 34

When an current flowing wire is placed in a magnetic field, and the wire moves due to a force

Question 35

Why is there a force on the wire

Answer 35

The current in the wire creates a magnetic field around wire which interacts with the magnetic field of magnet.

Question 36

The force exerted on wire is increased by

Answer 36

A stronger magnet is used, the current is increased. More wire is used/more coils.

Question 37

To reverse the direction of the wire (cause wire to move in opposite direction) you

Answer 37

Reverse the magnetic field/ reverse the current

Question 38

Flemings left hand rule

Answer 38

First finger- magnetic field from N to S Second finger- current direction (flows from positive to negative side of battery) Thumb- shows which way the wire moves (the force on wire)

Question 39

Right hand grip rule

Answer 39

Thumb- current | Other fingers- magnetic field

Question 40

Motor

Answer 40

Component that produces rotation from the combination of the fields due to magnets and current-carrying wires

Question 41

Rare fraction

Answer 41

A part of a sound wave where the pressure is low

Question 42

Slip rings

Answer 42

The component of an alternator that connects the coil to a external circuit so an alternating potential difference is produced

Question 43

Solenoid

Answer 43

A coil of wire

Question 44

When does a coil fo wire produce a magnetic field

Answer 44

When a electrical current is introduced to it

Question 45

Split ring commutator

Answer 45

A component of a direct current motor or DC generator