Electric & Magnetic Fields

Visualise invisible fields: electric field lines and equipotentials of point charges, Coulomb's law, 3D magnetic fields of wires, loops and solenoids, magnetic force on currents, and electromagnetic induction in coils, transformers and generators.

14 interactive Physics simulations on electric & magnetic fields.

Electromagnetic Induction – Magnet, Coil and Galvanometer Physics · Electric & Magnetic Fields Drag a bar magnet into or out of an N-turn coil connected to a galvanometer, or let the magnet move by itself. The... Ages 17–18
Charges and electric fields – field vectors, potential and equipotentials Physics · Electric & Magnetic Fields Tap a button to take a +1 nC or −1 nC charge from the supply and drag it anywhere in the play area (up to 20... Ages 16–17
Electric field – two point charges Physics · Electric & Magnetic Fields Two point charges q₁ and q₂ sit a distance d apart. Watch the electric field lines, the Coulomb force F = k|q₁q₂|/r²... Ages 16–17
Coulomb's law – force between two charges Physics · Electric & Magnetic Fields Two charges sit on an axis: drag them directly or use the sliders to change the magnitude (including the sign) of q₁... Ages 16–17
DC motor – split-ring commutator, F = BIL, torque and back EMF Physics · Electric & Magnetic Fields A coil of N turns spins between two magnet poles, fed through a split-ring commutator and brushes. Change the... Ages 17–18
Charged particles in a uniform electric field – electron gun and deflection tube Physics · Electric & Magnetic Fields An electron gun accelerates electrons, protons or alpha particles through a potential difference Vₐ (|q|Vₐ = ½mv²);... Ages 16–17
2D + 3D Magnetic force on a current and on charged particles Physics · Electric & Magnetic Fields Wire mode: a wire segment of length l carrying current I sits in a uniform magnetic field B at angle α; the magnetic... Ages 17–18
Electromagnetism lab – induction, transformer, generator Physics · Electric & Magnetic Fields Six experiment screens on electromagnetic induction: a bar magnet with a compass and a field meter; moving a magnet... Ages 17–18
3D Electric Flux and Gauss's Law 3D – Sphere, Cylinder and Box Physics · Electric & Magnetic Fields A rotatable 3D model: place point charges, a line charge, a charged plane or a charged spherical shell, then choose... Ages 16–17
Self-inductance – RL circuit and time constant τ = L/R Physics · Electric & Magnetic Fields Build a solenoid (turns, length, radius, iron core) to get L = μ₀μᵣN²A/l, then switch an RL circuit on and off: the... Ages 17–18
3D 3D Magnetic Field of a Current – Straight Wire, Circular Loop and Solenoid Physics · Electric & Magnetic Fields A rotatable 3D model of the magnetic field lines around a long straight wire (concentric circles, right-hand grip... Ages 17–18
Conductors in electrostatic equilibrium – sharp points, Faraday cage, connected spheres and dielectrics Physics · Electric & Magnetic Fields Put a conductor (round, pear-shaped with a sharp tip, a bar or a hollow box) in a uniform electric field and let its... Ages 16–17
Community DC Electric Motor Physics · Electric & Magnetic Fields Interactive model of a direct current electric motor with a split-ring commutator. Observe Fleming's left-hand rule,...
Community Ohm's Law Circuit and V-I Graph Physics · Electric & Magnetic Fields Investigate the relationship between voltage, resistance, and electric current in a simple DC circuit. Plot...