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Physics · Electricity & Magnetism

Field Lab

Map magnetic and electric fields in 3D, grip a wire with the right-hand rule, push a magnet through a coil and build a motor.

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The course

8 worlds · 34 lessons

World 1 · Magnets

FREEPoles, field lines, compasses and the field of the Earth
  1. 01Poles and forcesLike poles repel, unlike poles attract · 6 min
  2. 02Field lines and iron filingsDrawing an invisible field · 6 min
  3. 03The compass and Earth's fieldWhy a needle points north · 7 min
  4. 04Fields fade fastDouble the distance, one eighth of the field · 7 min
  5. 05Neutral pointsWhere fields cancel to zero · 6 min

World 2 · Electric fields

PROCharge, Coulomb's law, field lines and potential
  1. 01Charge and Coulomb's lawHow hard charges push and pull · 7 minPRO
  2. 02Field lines and superpositionMapping the push around charges · 7 minPRO
  3. 03The zero-field pointWhere two pushes cancel · 7 minPRO
  4. 04Potential and equipotentialsThe electric landscape · 8 minPRO
  5. 05Forces on a test chargeF = qE · 6 minPRO

World 3 · Currents make fields

PROWires, loops, solenoids and electromagnets
  1. 01Oersted's discoveryA current moves a compass · 6 minPRO
  2. 02The right-hand grip ruleWhich way does the field circle? · 6 minPRO
  3. 03How strong? B = μ₀I/2πrCurrent up, distance down · 7 minPRO
  4. 04Current loopsA flat magnet made of wire · 7 minPRO
  5. 05Solenoids and electromagnetsMany loops, one strong field · 9 minPRO

World 4 · Induction

PROFaraday's law, flux and Lenz's law
  1. 01Faraday's discoveryA moving magnet makes a voltage · 6 minPRO
  2. 02Flux and Faraday's lawEMF = −N ΔΦ/Δt · 8 minPRO
  3. 03No change, no EMFBig flux is not enough · 6 minPRO
  4. 04Lenz's lawThe induced current fights back · 8 minPRO
  5. 05Reversing the EMFOpposite change, opposite swing · 6 minPRO

World 5 · Motors & generators

PROTurning current into motion and back again
  1. 01Force on a currentF = I L × B · 7 minPRO
  2. 02Torque on a coilτ = N I A B sin θ · 7 minPRO
  3. 03The commutatorWhy a plain coil only rocks · 8 minPRO
  4. 04Reversing and speeding upDirection and speed control · 7 minPRO
  5. 05The generatorA motor run backwards · 8 minPRO
  6. 06AC or DC?Slip rings versus commutator · 7 minPRO

World 6 · Equipotential surfaces in space

PRO
  1. 01Lift a charge into spacePRO

World 7 · Transformers and shared flux

PRO
  1. 01Step down and step upPRO
  2. 02The load determines the currentPRO
  3. 03Changing flux is essentialPRO

World 8 · Electromagnetic waves

PROE and B travelling together, wavelength and polarisation
  1. 01E, B and the direction of travelA transverse wave of two fields · 8 minPRO
  2. 02Frequency and wavelength: c = fλOne wavelength per period · 8 minPRO
  3. 03Linear, circular and elliptical polarisationTwo components and a phase · 8 minPRO
  4. 04Polarisers and Malus’s lawThe three-polariser surprise · 8 minPRO
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Guides for Field Lab

All guides →
Parents
Sun, Earth & MoonKids Zone Safety Guide for Parents: What to KnowA plain-language guide to how the Novareka kids zone protects children aged 6–10: no ads, no accounts, no tracking, parent-only controls and easy deletion.4 min read
Parents
Sun, Earth & MoonScience at Home With the Family Plan: A Weekly RoutineHow a family can use the Family plan: kid profiles, a weekly rhythm, safe kitchen-table follow-ups and good questions to ask, from a short weekly parent e-mail.3 min read
Explainer
Field LabHow Magnetic Fields Work: Poles, Field Lines and CompassesSee how magnets push and pull through empty space, how field lines map the invisible, why a compass points north, and why the field fades so quickly with distance.4 min read