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Starter track

Follow the authored sequence, or switch to recap mode for a faster review of the same path.

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Starter track3 concepts3 checkpoints80 min

Magnetism

Not started

Start with current-made magnetic fields, turn changing flux into induced emf with Faraday and Lenz, and then reuse that same field direction story to explain magnetic force on charges and currents.

Use this track when you want the current magnetism branch in one bounded pass instead of a detached rule list. Magnetic Fields fixes the circular field pattern around current, Faraday's Law and Lenz's Law turns changing linkage into induced emf on one compact magnet-and-coil stage, and Magnetic Force on Moving Charges and Currents closes by reusing that same field direction in a bounded force-and-curvature model.

B-field patternsFaraday / LenzChanging fluxForce direction

Entry diagnostic

Decide where to enter this path without opening a second testing system.

After the authored electricity prerequisite, reuse the magnetic-field and induction checkpoint challenges to see whether the field-direction story is already strong enough to enter at magnetic force.

Review prerequisite first0 / 2 probes ready

Check the magnetic bridge before you skip into force

Review prerequisite first

Electricity is the authored prerequisite for Magnetism. Electric Fields opens this track and sets up the rest of the path. Nothing is hard-gated here; this is simply the clearest setup before the track opens.

Uses the same local-first quick tests, checkpoint challenges, and track history already saved in this browser.

Start Electricity prerequisite trackBegin with Magnetic Fields
  1. ChallengeNot started7 checks

    Field-direction checkpoint

    Use the existing magnetic superposition challenge to confirm the right-hand-rule picture before the branch widens.

    No saved checkpoint attempt yet.

    B-fields
    Open Build the upward magnetic field
  2. ChallengeNot started7 checks

    Faraday/Lenz checkpoint

    Use the existing induction challenge to verify that linked flux and zero-emf turning points are already secure.

    No saved checkpoint attempt yet.

    Faraday / Lenz
    Open High flux, zero emf

Why this order

The sequence is authored to keep the model honest.

Magnetic Fields comes first because induction and force are harder to trust if the field direction still feels like a mnemonic. Once the current-made field pattern is stable, Faraday's Law and Lenz's Law can stay honest about changing flux, zero-emf turning points, and opposition to change on one compact moving-magnet setup. Magnetic Force on Moving Charges and Currents then closes the path by reusing that same B-field direction for both moving charges and current segments instead of pretending the branch has already turned into a full electromagnetism course.

Shared concept pages

Each step opens the same simulation-first framework.

Compare mode, prediction mode, quick test, worked examples, guided overlays, challenge mode, and read-next cues stay on the concept pages. The track only decides the guided order and the next recommended stop.

Guided path

Follow the concepts and checkpoint moments in order.

Checkpoint cards reuse the authored challenge entries already living on the concept pages.

  1. 1Not startedMastery: NewStart here

    Magnetic Fields

    See how current direction, wire spacing, distance, and superposition set the magnetic field around one or two long straight wires, with the stage arrows and scan graphs tied to the same live source pattern.

    Start here before moving into Faraday's Law and Lenz's Law.

    ElectromagnetismIntro25 min
    Start concept
  2. Checkpoint 1LockedNot started

    Magnetic superposition checkpoint

    Pause before induction by building the midpoint-above case where the sideways pieces nearly cancel while the upward field survives as one net vector.

    Finish Magnetic Fields first. This checkpoint ties together B-fields through Build the upward magnetic field.

    Pause here after Magnetic Fields before moving into Faraday's Law and Lenz's Law.

    B-fields7 checksCoreGraph-linkedGuided start
    Return to B-fieldsOpen concept
  3. 2Not startedMastery: New

    Faraday's Law and Lenz's Law

    Track one magnet passing one coil and see how changing magnetic flux linkage creates induced emf while Lenz's law fixes the response direction, with the stage, galvanometer, and graphs all driven by the same bounded motion.

    Builds on Magnetic Fields before setting up Magnetic Force on Moving Charges and Currents.

    ElectromagnetismIntro25 min
    Open concept
  4. Checkpoint 2LockedNot started

    Faraday/Lenz checkpoint

    Use the centered-magnet pass to separate strong linked flux from near-zero emf before the path moves into magnetic force.

    Finish Faraday's Law and Lenz's Law first. This checkpoint ties together B-fields and Faraday / Lenz through High flux, zero emf.

    Pause here after Faraday's Law and Lenz's Law before moving into Magnetic Force on Moving Charges and Currents.

    B-fieldsFaraday / Lenz7 checksCoreGraph-linkedGuided start
    Return to Faraday / LenzOpen concept
  5. 3Not startedMastery: New

    Magnetic Force on Moving Charges and Currents

    Launch one moving charge through a uniform magnetic field, compare it with a same-direction current segment, and connect force direction, curvature, and current-based force on one bounded live stage.

    Capstone step after Faraday's Law and Lenz's Law.

    ElectromagnetismIntro30 min
    Open concept
  6. Checkpoint 3LockedNot started

    Magnetic force direction checkpoint

    Close the path by separating the moving-charge bend from the current-segment push while both still use the same field direction story.

    Finish Magnetic Force on Moving Charges and Currents first. This checkpoint ties together B-fields, Faraday / Lenz, and Magnetic force through Charge down, wire up.

    Final checkpoint that closes the authored track after Magnetic Force on Moving Charges and Currents.

    B-fieldsFaraday / LenzMagnetic force8 checksCoreGraph-linkedGuided start
    Return to Magnetic forceOpen concept