Starter track
Follow the authored sequence, or switch to recap mode for a faster review of the same path.
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.
Entry diagnostic
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.
Check the magnetic bridge before you skip into force
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.
Starting from Same-current sweep, reverse Wire B so the sideways parts nearly cancel while the net magnetic field points strongly upward above the midpoint.
No saved checkpoint attempt yet.
Starting from Approach and pass, hold the magnet near the coil center so the coil still links strong flux while the induced emf drops near zero.
No saved checkpoint attempt yet.
About this track
Keep the first scan focused on the next lesson. Open the authored rationale and shared-framework notes only when you need them.
Why this order
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
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
Checkpoint cards reuse the authored challenge entries already living on the concept pages.
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.
Starting from Same-current sweep, reverse Wire B so the sideways parts nearly cancel while the net magnetic field points strongly upward above the midpoint.
Finish Magnetic Fields first. This checkpoint ties together B-fields through Build a straight-up field.
Pause here after Magnetic Fields before moving into 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.
Starting from Approach and pass, hold the magnet near the coil center so the coil still links strong flux while the induced emf drops near zero.
Finish Faraday's Law and Lenz's Law first. This checkpoint ties together B-fields and Faraday / Lenz through Strong flux, almost zero emf.
Pause here after Faraday's Law and Lenz's Law before moving into Magnetic Force on Moving Charges and Currents.
See why a magnetic field bends a moving charge sideways, why faster charges can make wider arcs, and how the same cross-product direction rule pushes a current-carrying wire.
Capstone step after Faraday's Law and Lenz's Law.
Starting from Positive bends down, change the setup so the moving charge force points downward while the wire-segment force points upward for the same rightward direction.
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.
