World 3 · Currents make fields · 7 min · PROCurrent loops
A flat magnet made of wire
PRO · Field Lab
World 3: Currents make fields is part of PRO
The first world of Field Lab is free. PRO opens the other 29 lessons in 7 worlds — simulations, quizzes and all.
PRO includes
- All 26 labs — every world, every lesson
- Practice exams and certificates
$8.33/mo, billed yearly ($99.99) · or $39.99 monthly