Fleming's Left-Hand Rule: "FBI" — Force (thumb), B-field (first finger), I-current (second finger). Hold your left hand with all three at right angles to each other.
Left hand vs Right hand:
- Left hand = motor effect (force on conductor). Remember: Left = Load bearing / Lifting things (motors lift and move)
- Right hand grip rule = field direction around a wire
DC Motor components — CMBS:
- Coil (carries current)
- Magnets (provide field)
- Brushes (connect supply)
- Split-ring commutator (reverses current)
This memory aid covers Memory Aid within The Motor Effect for GCSE Physics. Revise The Motor Effect in Magnetism for GCSE Physics with 19 exam-style questions and 12 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 8 of 12 in this topic. Use it for quick recall, then test yourself straight afterwards so the memory aid becomes usable in an answer.
Practice questions for The Motor Effect
What is the motor effect?
Explain how Fleming's left-hand rule is used to find the direction of the force on a current-carrying conductor in a magnetic field.