Induction & AC Lab

Everywhere

• Topic tabs (under the title) switch between simulations in this lab. Some topics have smaller buttons under the stage for their screens.
• Teach shows live equations with the current numbers and "What to notice" points. Practice gives a numeric problem and a quiz.
• Move the sliders or tap the chips in the right-hand panel. The readings box updates live.
• Pause / Restart control the animation. Clean view hides everything except the stage, for projecting or recording; press Esc to leave it.
• In Practice, type a number (e.g. 12.5 or 3.2e-10), press Check or Enter. Show it on the stage sets the simulation to that problem.
• Nothing is saved: scores reset when the page is reloaded.

Faraday's law

• Magnet & coil: let it move to and fro, or move it yourself with the position slider. The needle kicks only while the magnet moves, and the graph shows why the emf is zero at the centre.
• Rod on rails: ε = BLv, with the opposing force BIL drawn on the rod.
• What changes the flux: change B, change the area, or turn the coil — the emf curve is the slope of the flux curve.

Lenz's law

• Push in, pull out: the face of the coil becomes the pole that opposes you, and the current direction follows.
• Magnet in a metal tube: the same magnet dropped down a plastic and a copper tube; eddy currents give a terminal speed.
• Where the energy comes from: your power Fv and the heat I²R, side by side.

Self induction

• Inductance of a coil: L = μ₀μᵣN²A/l with turns, length, radius and core; the graph shows L ∝ N².
• Growth & decay: switch on and off and watch the current rise and fall with τ = L/R.
• Energy stored: U = ½LI² on a parabola.

Mutual induction

• Mutual inductance: a triangular primary current gives a square-wave secondary emf, ε₂ = −M dI₁/dt.
• Transformer: set the turns, the primary voltage and the load; the bars show input, output and losses.

Generator & dynamo

• A rotating coil between the poles, with the output traced beside it. Switch between slip rings (a.c.) and a split-ring commutator (d.c.).

Peak, mean & rms

• On the waveform: peak, rms and half-cycle mean marked on the same sine wave.
• The effective value: the i² curve and its average, and two lamps that glow equally.

AC circuits & resonance

• R, L or C alone: the phase between voltage and current, with a phasor diagram.
• Series LCR: phasors, the impedance triangle, Z, φ and the power factor.
• Resonance: the current-against-frequency curve with f₀ marked.

Language

• Choose English or বাংলা once on the home page (top right); every lab then opens in that language — tabs, controls, readings, equations, notes, problems and quizzes.

Full guide with teaching tips: User manual (also as a PDF).