What you’ll learn6 learning objectivesChoose one objective for a focused lesson, or study the complete topic.—D.4.1 (HL)—Magnetic flux• Magnetic flux: Φ=BA cosθ.Syllabus objective—D.4.2 (HL)—Faraday’s law• Faraday’s law: changing magnetic flux induces emf ε=-NΔΦ/Δt.Syllabus objective—D.4.3 (HL)—Motional emf• Motional emf in a straight conductor: ε=BvL.Syllabus objective—D.4.4 (HL)—Lenz’s law• Lenz’s law gives induced emf direction and reflects energy conservation.• Direction of induced emf opposes the change that produces it.Syllabus objective—D.4.5 (HL)—Rotating-coil emf• Rotating coil in uniform magnetic field produces sinusoidal emf.Syllabus objective—D.4.6 (HL)—Rotation frequency and emf• Increasing rotation frequency increases induced emf characteristics.Syllabus objective