A long straight conductor passes vertically through the centre of a test area. Magnetic field sensors are placed around the conductor. The positions and field directions are viewed from above.
| Position of sensor relative to the conductor | Distance from the conductor in m | Direction of magnetic field at the sensor | Magnetic flux density in mT |
|---|---|---|---|
| north | 0.10 | east | 0.60 |
| east | 0.10 | south | 0.60 |
| south | 0.20 | west | 0.30 |
| west | 0.20 | north | 0.30 |
Describe what the data show about the shape and strength of the magnetic field around the conductor. The current is then reversed and increased in size. Explain how these changes affect the magnetic field.
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.