Discussion
The law that is a symmetrical counterpart of Faraday's law of electromagnetic induction is
Answer: A
The symmetrical counterpart is the Ampere-Maxwell law.
Faraday's law says a changing magnetic flux produces an electric field (an induced emf). Maxwell's addition to Ampere's law, the displacement current, says a changing electric flux produces a magnetic field:
\[ \begin{aligned} &\oint \vec{B}\cdot d\vec{l} \\ &= \mu_0\left(I + \varepsilon_0\frac{d\Phi_E}{dt}\right) \end{aligned} \]
The two laws mirror each other, which is what allows electromagnetic waves. Ampere's circuital law without Maxwell's term has no changing-field part; Gauss's law and Coulomb's law concern static charges, and Lenz's law only gives the direction of the induced current.
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