A student is testing four different magnet assemblies, Alpha, Beta, Gamma, and Delta, for potential use in a high-performance loudspeaker. A straight 5.0 cm length of wire within the voice coil is placed perpendicular to the magnetic field in each assembly. The force exerted on the wire is measured for different currents.
The results are shown in the table below:
| Magnet Assembly | Force on wire (N) | Current in wire (A) |
|---|---|---|
| Alpha | 0.16 | 0.4 |
| Beta | 0.48 | 1.6 |
| Gamma | 0.25 | 0.5 |
| Delta | 0.30 | 1.2 |
Determine which magnet assembly produces the greatest magnetic flux density, justifying your answer with calculations.
16 exam-style questions on OCR GCSE Physics Uses of magnetism. Each one has a worked solution and a mark scheme showing where the marks go.