Question

Which of the following Maxwell equation is obtained from Amperes law?

(a) ∇×H=J

(b) emf=\(-\frac{\partial \phi}{\partial t}\)

(c) ∇×E=\(\frac{-\partial B}{\partial t}\)

(d) ∇×D=ρv

The question was asked during an interview for a job.

Origin of the question is Radiation topic in section Radiation, Baluns & Polarization of Antennas

Answer 1

Correct answer is (a) ∇×H=J

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

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

Gauss Law for electric field     : D=ρv

Gauss law for magnetic field  : ∇.B=0