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Moving charge produces a magnetic field — Oersted's 1820 compass-deflection discovery.
Force on a current segment and torque on a current loop.
Line integral of B equals μ₀ times enclosed current; symmetric cases.
Conversion of electrical to mechanical energy via torque on a loop.
Φ = B·A·cosθ as the central quantity of induction.
Rate of change of flux equals induced EMF.
Induced current opposes the change — a statement of energy conservation.
Sinusoidal EMF from a rotating coil in a magnetic field.
Voltage ratio equals turns ratio; rationale for high-V transmission.