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Which of the following Maxwell equation is correct for a non-conducting and lossless medium?(a) ∇.D=ρv(b) ∇.D=0(c) ∇×D=ρv(d) ∇×E=0The question was posed to me during an online exam.My doubt stems from Radiation topic in division Radiation, Baluns & Polarization of Antennas

Answer» CORRECT ANSWER is (b) ∇.D=0

Explanation: SINCE it is given non-conducting medium, the charge density ρv=0 and current density J=0. The Maxwell equations are:

Faradays Law: ∇×E=\(-\frac{\PARTIAL B}{\partial t}\)

Amperes Law: ∇×H=\(\frac{\partial D}{\partial t}\)

Gauss Law for electric FIELD: ∇.D=0

Gauss law for magnetic field: ∇.B=0


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