Consider a plane polarized electromagnetic wave in the vacuum described by the vector and scalar potentials, A(r, t) Ae(kr-wt) D(r, t) = Poe(kr-wt) where the orientation of the vector Ao is arbitrary. a) Using Maxwell's equations, find the relationship that must hold between Ao and po b) Using the principal of gauge invariance, show that one can transform to a new but physically equivalent vector potential which is transversely polarized, i.e. Ao k-0. Explicitly find the gauge transformation function x that does this. c) What is the scalar potential p(r, t) in the gauge of part (b)?

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Consider a plane polarized electromagnetic wave in the vacuum described by the vector and scalar potentials,
A(r, t) Ae(kr-wt)
D(r, t) = Poe(kr-wt)
where the orientation of the vector Ao is arbitrary.
a) Using Maxwell's equations, find the relationship that must hold between Ao and po
b) Using the principal of gauge invariance, show that one can transform to a new but physically equivalent vector potential which is
transversely polarized, i.e. Ao k-0. Explicitly find the gauge transformation function x that does this.
c) What is the scalar potential p(r, t) in the gauge of part (b)?
Transcribed Image Text:Consider a plane polarized electromagnetic wave in the vacuum described by the vector and scalar potentials, A(r, t) Ae(kr-wt) D(r, t) = Poe(kr-wt) where the orientation of the vector Ao is arbitrary. a) Using Maxwell's equations, find the relationship that must hold between Ao and po b) Using the principal of gauge invariance, show that one can transform to a new but physically equivalent vector potential which is transversely polarized, i.e. Ao k-0. Explicitly find the gauge transformation function x that does this. c) What is the scalar potential p(r, t) in the gauge of part (b)?
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