Oxford Revise AQA GCSE Combined Science Foundation | Chapter P12 answers

P12: Magnets and electromagnets

Question

Answers

Extra information

Mark

AO / Specification reference

01.1

B and C

both needed for the mark

1

AO1

6.7.1.1

01.2

A

1

AO1

6.7.1.1

01.3

non-contact

permanent

force

magnetic

1

1

1

1

AO1

6.7.1.1

02.1

a permanent magnet is always magnetic

an induced magnet becomes magnetic when it is put in a magnetic field

1

1

AO1

4.7.1.1

02.2

yes

(it has become an induced magnet) any magnet has a magnetic field around it

1

1

AO2

4.7.1.1

02.3

Left box ‘N’, middle box ‘S’, right box ‘N’

1

AO2

4.7.1.1

02.4

no

it is no longer magnetic when it is removed from the magnetic field

1

1

AO2

4.7.1.1

03.1

neodymium

1

AO2

6.7.1.1

03.2

bar chart

the magnets are names/words/categorical

1

1

AO2

6.7.1.1

03.3

the Earth’s magnetic field would be very difficult to plot on the same scale

1

AO3

6.7.1.1

03.4

you can turn it on and off

or

you can make an electromagnetic that is much stronger than a permanent magnet

1

AO3

6.7.2.1

04.1

one mark for correct shape – at least four lines drawn

one mark for arrows going from north to south

2

AO1

6.7.1.2

04.2

a compass/iron filings

1

AO1

6.7.1.2

04.3

cobalt

nickel

1

1

AO1

6.7.1.2

05.1

\(\rm{acceleration} =
\frac{\rm{change\ in\ velocity}}{\rm{time}}
\)
\(\rm{accept\ a} =
\frac{\Delta \rm{v}}{\rm{t}}
\)

1

AO1

6.5.4.1.5

05.2

\(\rm{acceleration}=\frac{2.7-0.5}{0.4}\)

= 5.5 m/s2

1

1

AO2

6.5.4.1.5

05.3

force = mass × acceleration

accept F = ma

AO1

4.5.6.2.2

05.4

2.0 = 0.4 acceleration

\(\rm{acceleration} =
\frac{2.0}{0.4}
\)

= 5.0 m/s2

1

1

1

AO2

6.5.4.2.2

05.5

there is an uncertainty in all measurements/difficult to pull with a constant force

1

AO3

6.5.4.1.5

6.5.4.2.2

06.1

material

iron

force

weaker

1

1

1

1

AO1

6.7.2.1

06.2

it gets stronger

1

AO2

6.7.2.1

07.1

higher

shorter

the same

1

1

1

AO1

6.6.2.1

07.2

increases the risk of skin cancer

or

causes premature aging

1

AO1

6.6.2.3

07.3

correct use:

  • tanning
  • energy efficient lamps
  • checking for forgeries
  • killing insects/bacteria

1

AO1

6.6.2.4

08.1

electromagnet

stronger

1

1

AO1

6.7.2.1

08.2

there is a magnetic field around the electromagnet

the paperclip is mad from steel, which is a magnetic material

accept paperclip is attracted to the electromagnet

1

1

AO3

6.7.2.1

08.3

smaller distance from

the electromagnet/strength of magnetic field is weaker than before

1

1

AO3

6.7.2.1

08.4

yes, it will move

there is a magnetic field around the wire

1

1

AO3

6.7.2.1

6.7.2.2

09.1

(towards) north/the north magnetic pole

there is a magnetic field around the Earth

1

1

AO1

6.7.1.2

09.2

the magnetic field around the wire is stronger than the magnetic field of the Earth

the needle of the compass changed direction when the current was switched on

1

1

AO2

6.7.1.2

09.3

a compass needle is a magnet

1

AO1

6.7.1.2

10.1

the wire will get hot when it is connected to the battery

only connect the wire for short periods of time

1

1

AO2

6.7.2.1

10.2

magnetic field with the same shape as that of a bar magnet

1

AO1

6.7.2.1

10.3

solenoid B

it has more turns

1

1

AO2

6.7.2.1

10.4

the compass needle does not move

the field in the centre of a solenoid is uniform/does not change

1

1

AO2

6.7.2.1

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