An electromagnet is used to remove small steel fragments from grain moving along a conveyor. A technician changes the current in the coil and measures the magnetic flux density at a fixed position near the electromagnet. The number of turns and the iron core are kept the same.
| Current in the coil in A | Magnetic flux density in T |
|---|---|
| 0.50 | 0.015 |
| 1.00 | 0.030 |
| 1.50 | 0.045 |
| 2.00 | 0.060 |
Describe how the magnetic flux density changes as the current is increased.
90 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.