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Physics > P4 > Flashcards

P4 Flashcards

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1
Q

Magnetic field

A

Space around magnetic where another magnetic material experiences a force

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2
Q

Permanent magnets materials

A

Iron. Nickel. Cobalt. Alloys( steel)

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3
Q

What happens when you hit a magnet with hammer

A

It will lose its magnetism

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4
Q

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

A

Stroking it

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5
Q

Before the magnetism, the domains point in

A

random directions

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6
Q

After magnetism , the domains point in

A

The same direction

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7
Q

A permanent magnet produces its own

A

Magnetic field

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8
Q

An induced magnet is a

A

Material that becomes magnetic when placed under magnetic field

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9
Q

What force does induced magnetism cause

A

Forces of attraction

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10
Q

When removed from the magnetic field an induced magnet will

A

Lose most or all of its magnetism quickly

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11
Q

Where is a magnetic field the strongest in a permanent magnet

A

The poles

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12
Q

A alternating potential difference is

A

Potential difference that constantly changes direction

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13
Q

Alternator

A

Generator that produced an alternating potential difference

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14
Q

Compass is a

A

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

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15
Q

Diaphragm is the

A

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

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16
Q

Domain is

A

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

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17
Q

Dynamo

A

A generator which produces a direct potential difference

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18
Q

Electromagnetic induction is

A

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

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19
Q

Compasses always post by towards the

A

Earths North Pole

20
Q

A current flowing through a wire creates

A

a magnetic field around the wire

21
Q

The shape of a current flowing through a wire is

A

Concentric circles

22
Q

Distance vs magnetic field strength graph

A

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

23
Q

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

A

Falls more slowly

24
Q

A larger current will give a

A

Stronger magnetic field

25
Q

In the right hand grip rule, the thumb is the

A

Current direction

26
Q

In the right hand grip rule, the fingers are the

A

Magnetic field direction

27
Q

The magnetic field for a solenoid is like a

A

Bar magnet

28
Q

To increase a solenoid magnetic field you

A

Increase current. Increase turns. Place iron core inside solenoid

29
Q

A solenoid is

A

Lots of cool around wire

30
Q

Frequency is

A

The number of waves per second

31
Q

Induced potential difference is the

A

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

32
Q

Loud speaker

A

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

33
Q

Microphone

A

Converts sound wave into electrical signal

34
Q

What is the motor effect

A

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

35
Q

Why is there a force on the wire

A

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

36
Q

The force exerted on wire is increased by

A

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

37
Q

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

A

Reverse the magnetic field/ reverse the current

38
Q

Flemings left hand rule

A

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)

39
Q

Right hand grip rule

A

Thumb- current

Other fingers- magnetic field

40
Q

Motor

A

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

41
Q

Rare fraction

A

A part of a sound wave where the pressure is low

42
Q

Slip rings

A

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

43
Q

Solenoid

A

A coil of wire

44
Q

When does a coil fo wire produce a magnetic field

A

When a electrical current is introduced to it

45
Q

Split ring commutator

A

A component of a direct current motor or DC generator

Physics (5 decks)

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