The effect of magnetic field uniformity on the magnetic properties of silicon steel is that it can significantly impact the material's magnetic performance. A uniform magnetic field helps to minimize magnetic losses, improve magnetic permeability, and increase the efficiency of magnetic devices made from silicon steel. Conversely, non-uniform magnetic fields can cause uneven magnetization and result in decreased magnetic properties and increased energy losses. Therefore, maintaining magnetic field uniformity is crucial for optimizing the magnetic properties of silicon steel.