The solenoid, the force on a wire and parallel wires

Week 5 · Chapter 2 (B): the solenoid (B = μnI = μNI/ℓ, poles by the screw rule), the force on a current-carrying wire in a magnetic field (F = BIℓ sin θ, Fleming’s left-hand rule, the tesla) and the force between two parallel wires · 3 lessons