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P4 General Studies: Magnetism and the Compass (Paper 2 (intermediate))
Tutor Prep Guide · the digestive system and the food pyramid, enzymes and bile, energy and nutrient calculations, and balanced eating habits
P4 General Studies: Magnetism and the Compass (Paper 2 (intermediate))
Paper two adds magnetic fields, magnetisation and the Earth field, comparing lift at different distances.
Direct answers When finding percentage points, identify the original value first; the wrong denominator always gives a wrong answer.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 |
| Suggested time | 20 |
| Difficulty mix | Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1 |
| Chapter | Chapter: P4 General Studies: Magnetism and the Compass |
| Level | parts of a closed circuit, conductors against insulators, series against parallel, adding up battery voltage, and electrical safety |
02 Questions (10 items)
- FoundationWhat is a magnetic field?
- FoundationWhat happens when a nail is stroked many times along one direction on a magnet?
- FoundationWhich magnetic property does a maglev train use?
- IntermediateThe Earth acts like a large magnet. Where is the compass north pole attracted to?
- IntermediateAt 3 cm a magnet lifts 9 nails; at 6 cm it lifts only 3. What proportion of the original is that, in percentage points?
- IntermediateA magnet lifts three eighths of 24 iron nails. How many nails is that?
- ChallengeA magnet lifts 30 of 40 iron nails. What proportion is that, in percentage points?
- ChallengeA bar magnet is cut into 3 pieces. How many poles are there altogether?
- ChallengeOf 6 compasses placed in a classroom, 4 point the same way. What proportion is that, in percentage points?
- Error redoError clinic: magnetic field lines cross each other. True?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | The region around a magnet where magnetic force acts. | Sprinkle iron filings around a magnet to show the direction and strength of the field. |
| 2 | The nail becomes temporarily magnetised. | The magnetic domains line up, so the nail behaves like a small magnet for a while. |
| 3 | Like poles repel, so the train floats above the track. | The train and track carry like poles, so repulsion lifts it and friction falls sharply. |
| 4 | Towards the region near the geographic North Pole, which is a magnetic south pole. | Unlike poles attract, so the needle north end points north while the magnetic south pole sits near the geographic North. |
| 5 | 33.3 percentage points. | Three divided by 9 times 100 gives 33.3 percentage points, showing force weakens with distance. |
| 6 | 9 nails. | Multiply 24 by 3 and divide by 8 to get 9 nails. |
| 7 | 75.0 percentage points. | Thirty divided by 40 times 100 gives 75.0 percentage points. |
| 8 | 6 poles. | Each piece has 2 poles, so 3 pieces give 6; a single isolated pole never appears. |
| 9 | 66.7 percentage points. | Four divided by 6 times 100 gives 66.7 percentage points. |
| 10 | No. | Field lines leave the north pole and enter the south pole and never cross, since crossing would mean two directions at one point. |
04 What to do after marking
- After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
- Repeat the same item two days later; move to the next paper only when both attempts are correct.
- Parents only need the answer and note columns; there is no need to explain every item.
Then try paper three, using voltage and current to work out power and resistance.Tutor Registration →
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