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P4 General Studies: Magnetism and the Compass (Paper 4 (error clinic))
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P4 General Studies: Magnetism and the Compass (Paper 4 (error clinic))
Paper four revisits the five commonest mistakes with four sums on pole counts and percentage points.
Direct answers Words such as always or every are usually the signal of a false statement.
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)
- FoundationAre copper and aluminium attracted by a magnet?
- FoundationDoes a broken magnet still have poles?
- FoundationWhy should an iron ruler not be placed beside a compass?
- IntermediateWhat happens when the south poles of two magnets face each other?
- IntermediateTwo magnets have 2 poles each. After breaking into 4 pieces altogether, how many poles are there?
- IntermediateA magnet lifts 6 of 10 iron nails. What proportion is that, in percentage points?
- ChallengeOf 5 compass readings, 4 agree. What proportion is that, in percentage points?
- ChallengeWhen the current is cut, an electromagnet falls from 10 units to 0. What is the decrease in percentage points?
- ChallengeOf 16 nails, 4 are aluminium. What proportion can the magnet lift, in percentage points?
- Error redoError clinic: heating a magnet makes it stronger. True?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | No. | Copper and aluminium are not magnetic; only iron, cobalt and nickel are attracted. |
| 2 | Yes, each piece has its own north and south pole. | New poles form at the break, so a magnet with only one pole is never found. |
| 3 | The iron disturbs the field and the reading becomes unreliable. | The ruler becomes magnetised and adds its own field, pulling the needle aside. |
| 4 | They repel each other. | Like poles repel, so the two magnets push apart. |
| 5 | 8 poles. | Four pieces with 2 poles each give 8 poles in total. |
| 6 | 60.0 percentage points. | Six divided by 10 times 100 gives 60.0 percentage points. |
| 7 | 80.0 percentage points. | Four divided by 5 times 100 gives 80.0 percentage points. |
| 8 | 100.0 percentage points. | All 10 units are lost, which is a decrease of 100.0 percentage points. |
| 9 | 75.0 percentage points. | Twelve nails can be lifted; 12 divided by 16 times 100 gives 75.0 percentage points. |
| 10 | No. | Heat or knocking scatters the domains and weakens the magnet, so keep magnets away from high heat. |
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.
With all four done, go back to the chapter page and revise the three parts of a closed circuit plus three safety habits.Tutor Registration →
Questions and answers are written originally by the TutorZone team and are not taken from any school, publisher or examination authority paper. Every value is checked by computer.