In a paper I am reading it states that(adsbygoogle = window.adsbygoogle || []).push({});

since the electric potential (and field) have sinusoidal time dependence, then

[tex]\Phi(\textbf{x},t)=\Phi(\textbf{x})e^{i\omega t}[/tex]

Why would this equation be true?

Why shoudnt the equations read

[tex]\Phi(\textbf{x},t)=Im(\Phi(\textbf{x})e^{i\omega t})[/tex]

Thanks in advance for your replies.

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# Sinusoidal Electric Field

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