A student investigates how the design of an electromagnet affects the number of paper clips it can pick up. Table shows the student's results.
Table: The number of turns, the core material and the number of paper clips picked up by four electromagnets
| Electromagnet | Number of turns | Core material | Number of paper clips |
|---|---|---|---|
| A | 100 | plastic | 2 |
| B | 100 | iron | 14 |
| C | 200 | iron | 26 |
| D | 300 | iron | 38 |
Give the conclusion that can be made by comparing electromagnets A and B.
Describe the pattern shown by electromagnets B, C and D.
Give one variable the student must keep the same for all four electromagnets.
39 exam-style questions on AQA GCSE Physics 7.2 The motor effect, covering 7.2.1 Electromagnetism, 7.2.2 Fleming's left-hand rule (HT only), 7.2.3 Electric motors (HT only), and 7.2.4 Loudspeakers (HT only). Each one has a worked solution and a mark scheme showing where the marks go.