A student investigates how the current in an electromagnet affects the number of paper clips it can pick up.
The Table shows her results.
Table
| Current in A\text{A}A | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 |
|---|---|---|---|---|---|
| Number of paper clips picked up | 3 | 6 | 9 | 8 | 15 |
Identify the anomalous result in the Table.
Predict the number of paper clips the electromagnet should pick up when the current is 2.0 A.
Describe the relationship between the current and the number of paper clips picked up.
Use data from the Table in your answer.
Give one variable the student must keep the same.
Suggest one reason why counting paper clips is not a very precise way to measure the strength of an electromagnet.
44 exam-style questions on OCR GCSE Physics 4.1 Magnets and magnetic fields, covering 4.1.1 Magnetic poles, attraction and repulsion, 4.1.2 Permanent and induced magnets, 4.1.3 The magnetic field of a magnet, 4.1.4 Compasses and the Earth's magnetic field, 4.1.5 The magnetic field around a current-carrying wire, 4.1.6 Field strength, current and distance, and 4.1.7 Solenoids and electromagnets. Each one has a worked solution and a mark scheme showing where the marks go.