Doppler Effect Visualization of the Doppler effect and Mach cones. Spectrum Explore the electromagnetic spectrum. Beats Vary two frequencies and see the corresponding beat pattern emerge. Piano Play the piano and see the frequencies. Electrostatics Deflection of Charges Change the voltage on the deflector plates and see the deflection of the electron beam.
Field Lines Drag two variable charges and watch the field lines.
Electrostatic Potential Place charges and watch the resulting electrostatic potential distribution. Capacitors Solves all kinds of capacitor network problems. Resistors Same thing for resistors. Sometimes it's just fun to play with pretty patterns. Lorentz Force Observe the deflection of a beam of charged particles in a magnetic field.