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JTPF
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Homework Statement
The field E(r,t) can be written as a Fourier expansion of plane waves [tex]E(r,t)=∫E(k,w)e^{i(kr-wt)}d^{3}kdw[/tex] with similar expansions for other fields.
Need to show the derivation of [tex]kXE(k,w)=wB(k,w)[/tex] from Faraday's law [tex]∇XE(r,t)=-∂B(r,t)/∂t[/tex] and also the derivation of [tex]kXH(k,w)=-wD(k,w)[/tex] from Ampere's law [tex]∇XH(r,t)=∂D(r,t)/∂t[/tex]
Homework Equations
[tex]∫e^{ax}=(1/a)e^{ax}[/tex]
The Attempt at a Solution
I thought the Fourier expansion expression for E meant to integrate with once with respect to w and three times with respect to k, so get:
[tex]∫E(k,w)e^{i(kr-wt)}d^{3}kdw = (1/r)x(1/r)x(1/r)x(-1/t)e^{i(kr-wt)}=(-1/r^{3}t)e^{i(kr-wt)}[/tex]
But that clearly doesn't give the result, no k or w there at all... what am I doing wrong? I get this isn't tricky but can't figure it out.
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