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World 5 · Motors & generators · 7 min · PRO

Torque on a coil

τ = N I A B sin θ

PRO · Field Lab

World 5: Motors & generators 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.

  • Force on a current
  • The commutator
  • Reversing and speeding up
  • The generator
  • AC or DC?
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  • All 26 labs — every world, every lesson
  • Practice exams and certificates

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