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.
#A-Level#Physics#Electromagnetism
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