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E (SI unit: V/m) is the electric field,
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D (SI unit: C/m2) is the electric displacement,
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H (SI unit: A/m) is the magnetic field,
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B (SI unit: Wb/m2) is the magnetic flux density or magnetic induction,
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ρ (SI unit: C/m3) is the charge density, and
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J (SI unit: A/m2) is the current density.
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k (SI unit: rad/m) is the wave vector,
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r (SI unit: m) is the position vector,
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ω (SI unit: rad/s) is the angular frequency,
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t (SI unit: s) is time, and
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εr (dimensionless) is the relative permittivity of the medium, and
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μr (dimensionless) is the relative permeability of the medium.
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