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World 3 · Currents make fields · 6 min · PRO

The right-hand grip rule

Which way does the field circle?

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.

  • Oersted's discovery
  • How strong? B = μ₀I/2πr
  • Current loops
  • Solenoids and electromagnets
  • Faraday's discovery
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