Magnetic fields of currents, forces on wires, parallel conductors and DC motors

What this note covers

1. Magnets, magnetic fields and Earth's field
2. The field of a long straight wire
3. Force on a current-carrying conductor
4. Parallel conductors and force per unit length
5. DC motors and commutators
6. Fields in practice: solenoids, electromagnets and shielding
7. Exam technique for magnetic forces

7 sections · 11 key terms & formulas · 6 common mistakes