Electromagnetic Induction
Interactive simulation — adjust parameters and watch the visualization update in real time.
Live graphs
How it works
Moving a magnet changes magnetic flux Φ through a coil. Faraday’s law gives induced emf ε = −dΦ/dt (here Φ includes N turns). Ohm’s law gives I = ε/R. Lenz’s rule is reflected in the sign: the induced current creates a field that opposes the change in flux.
Key equations
ε = − dΦ_total/dt , Φ_total = N Φ_one_turn
I = ε / R