Discussion
Which of the following laws does not form a Maxwell equation ?
Answer: A
The law that does not form a Maxwell equation is Planck's law.
Maxwell's four equations are Gauss's law for electricity, Gauss's law for magnetism (no magnetic monopoles), Faraday's law of induction, and Ampere's circuital law with Maxwell's displacement current added. Together they describe all classical electromagnetic fields and predict electromagnetic waves.
Planck's law describes the spectrum of black-body radiation and introduced the quantisation of energy, \(E = h\nu\). It belongs to thermal radiation and quantum physics and is not one of Maxwell's equations.
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