Torque on a Current Loop and the DC Motor

What this note covers

1. The Motor Effect and Force on a Current-Carrying Conductor
2. Torque on a Current-Carrying Coil: Deriving and Applying τ = nBIAcosθ
3. The Commutator: Maintaining Unidirectional Rotation
4. Back-EMF in an Operating DC Motor
5. Factors Affecting Motor Performance
6. HSC Exam Strategy: Linking Concepts in Extended Responses
7. Quantitative Summary Table and Unit Check

7 sections · 14 key terms & formulas · 6 common mistakes