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 |
Example answers: any three improvements and reasons from: 1. use an infrared detector instead of the thermometer because it will be more sensitive/give a more accurate reading/have better resolution 2. use the ruler to make sure the detector is the same distance from each can so that it is a fair test / it is a control variable 3. use a lid on each can to ensure the temperature of the water stays the same 4. same surface area of can so that it is a fair test / it is a control variable 5. surroundings have the same temperature so that it is a fair test / it is a control variable |
one mark for each improvement one mark for each reason (which must be consistent with the improvement) |
6 |
AO3 6.6.2.2 |
| 05.2 |
B it (thermometer) has the highest temperature, so is emitting the most infrared radiation |
1 1 |
AO2 6.6.2.2 |
|
| 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:
|
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 |