Twenty-four courses covering the worldwide canon, from kinematics to quantum mechanics. Every lesson pairs careful reading with problems and a live simulation.
Build the experiment, change the physics, and measure the result — directly in your browser.
Place lenses and mirrors, trace rays, and measure how real and virtual images form as the apparatus changes.
Build point-charge fields or solve Poisson boundary-value problems with conductors, dielectrics, probes, and visible numerical evidence.
Build real three-dimensional current sources, measure Ampere circulation and flux, trace particles, or solve a separately declared 2D material FEM model.
Investigate Faraday and motional EMF, mutual and self inductance, passive Lenz response, magnetic diffusion, eddy-current loss, shielding, and skin effect.