elektromagnetvälja

The electromagnetic field is a fundamental physical field describing how electric charges and currents interact. Classical electromagnetism expresses the field through Maxwell's equations, which relate the electric field E, the magnetic field B, charge density ρ, and current density J. The Lorentz force F = q(E + v × B) governs how charges move in the field. The E and B components are interrelated and can propagate as electromagnetic waves at the speed of light in vacuum, c ≈ 3.00 × 10^8 m/s. The field stores energy with density u = (ε0 E^2 + B^2/μ0)/2, and the energy flow is described by the Poynting vector S = (1/μ0) E × B.

In materials the field interacts via permittivity ε and permeability μ, which determine the refractive index n. The theory admits a description in terms of scalar and vector potentials (φ and A) and is formulated covariantly in relativity as the electromagnetic field tensor Fμν. Quantum electrodynamics treats the field's quanta, photons, as mediators of electromagnetic interactions. The electromagnetic field underpins many technologies, from radio and optics to medical imaging and wireless communications.

In Swedish, elektromagnetfält is the standard term for the electromagnetic field; elektromagnetvälja appears to be a misspelling.