Faraday’s Law Exam Focus | AQA A-Level 物理：法拉第定律考点精讲

📚 Faraday’s Law Exam Focus | AQA A-Level 物理：法拉第定律考点精讲

Faraday’s law of electromagnetic induction is the foundation for understanding how electricity is generated and transformed. In AQA A Level Physics, this topic bridges the concepts of magnetism and circuits, and it is heavily assessed in both theoretical calculations and practical applications. Mastering flux, flux linkage, and the rate of change is essential for success.

法拉第电磁感应定律是理解发电与变压原理的基础。在AQA A Level物理中，这个主题连接了磁学和电路的概念，并且在理论计算和实际应用考题中频繁出现。掌握磁通量、磁链及其变化率是取得高分的关键。

1. Magnetic Flux and Flux Linkage | 磁通量与磁链

Magnetic flux Φ (phi) quantifies the total magnetic field passing through a given surface. For a uniform magnetic field B and a plane area A, the flux is defined as Φ = B A cos θ, where θ is the angle between the direction of the magnetic field lines and the normal (perpendicular) to the surface.

磁通量Φ（phi）量化穿过给定表面的总磁场。对于均匀磁场B和平面面积A，磁通量定义为Φ = B A cos θ，其中θ是磁场方向与表面法线（垂线）之间的夹角。

When the field is perpendicular to the area (θ = 0°), cos θ = 1 and Φ = B A – the maximum flux. When the field is parallel to the area (θ = 90°), cos θ = 0 and Φ = 0. The SI unit of magnetic flux is the weber (Wb), where 1 Wb = 1 T m².

当磁场垂直于面积时（θ = 0°），cos θ = 1，Φ = B A，磁通量最大。当磁场平行于面积时（θ = 90°），cos θ = 0，Φ = 0。磁

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