12–15% of the AP exam. Key topics: Magnetic fields from current-carrying wires (right-hand curl rule), Force on a moving charge in a magnetic field (F = qvB sinθ, right-hand rule), Force on a current-carrying wire in a magnetic field (F = BIL sinθ), Right-hand rules: force on charges, force on wires, field direction from current, Circular motion of charged particles in uniform magnetic fields, Magnetic flux (Φ_B = BA cosθ), Faraday's law of induction (EMF = −ΔΦ_B/Δt), Lenz's law and direction of induced current, Electromagnetic induction: motional EMF, changing area, changing field, Qualitative understanding of transformers and generators.
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