A vibration monitor contains a coil that moves through the magnetic field of a fixed magnet.
During calibration, the coil in each prototype moved at the same peak speed through the same magnetic field. Apart from the differences shown in the table, the prototypes were identical.
| Prototype | Number of turns on coil | Mass of moving part in kg | Peak potential difference in mV |
|---|---|---|---|
| P | 250 | 0.040 | 24 |
| Q | 500 | 0.040 | 48 |
| R | 250 | 0.080 | 24 |
The monitor must produce a peak potential difference of at least 40 mV under these calibration conditions.
A technician claims that doubling the mass of the moving part is as effective as doubling the number of turns on the coil.
Using the results, evaluate the technician's claim. You should decide which prototype should be used in the monitor.
96 exam-style questions on AQA GCSE Physics 7.3 Induced potential, transformers and the National Grid (HT only), covering 7.3.1 Induced potential (HT only), 7.3.2 Uses of the generator effect (HT only), 7.3.3 Microphones (HT only), and 7.3.4 Transformers (HT only). Each one has a worked solution and a mark scheme showing where the marks go.