Frequently Asked Questions
What is Faraday's law?
EMF = -N·dΦ/dt. The induced EMF in a coil equals the rate of change of magnetic flux, times the number of turns, with a sign from Lenz's law.
What is a weber?
The SI unit of magnetic flux: 1 Wb = 1 T·m² = 1 V·s.
Why does AC work?
Rotating a coil in a magnetic field continuously changes its flux, inducing alternating EMF. That's how generators produce grid power.
What are the motional and coil-area forms of Faraday's law?
For a coil of fixed area A with N turns in a changing field, EMF = -N·A·(dB/dt). For a straight conductor of length L moving at speed v perpendicular to a field B, the motional EMF is EMF = B·L·v. Both are special cases of EMF = -N·dΦ/dt, since flux Φ = B·A.
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