🔗 Coupled Circuits — Flux in Motion

Two coils, one field, or one coil talking to itself: watch how flux linking multiple turns or multiple circuits drives an induced emf.

Every tab here is the same underlying law: emf = −N·dΦ/dt. What differs each time is WHICH factor in Φ = N·B·A·cosθ is doing the changing — B, A, θ, or N itself.

What is this?

Apparatus — drag the highlighted parts

Flux Φ through the circuit — is it changing?

Induced EMF — Lenz's law in action

Which way does the current actually flow?

Live calculation