A Level
A-Level Physics: Electromagnetism: Induced EMF & Lenz’s Law
•By Intuitional Team•1 min read
A-Level Physics — Electromagnetism: Induced EMF & Lenz’s Law: quick notes, common traps, and an exam-style example.
Induced EMF
Faraday’s Law: induced emf ∝ rate of change of flux linkage. Lenz’s Law: direction opposes change causing it.
Key equations
- Φ = BAcosθ
- emf = –dΦ/dt
Applications
Generators, transformers, induction cookers all rely on changing flux.
Exam habits
- Always mention negative sign shows opposition (energy conservation).
- Sketch flux linkage vs time graphs carefully.
- Units: 1 weber = 1 T·m².
Tags
A-LevelPhysicsElectromagnetism