Electric field

  • Thread starter S.M.M
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  • #1
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Hi,

In electromagnetic wave, electric field take the form

E(z,t)=A q(t) sin(kz)

where A is a constant, k is a wave number, and q(t) is a time dependent factor having the dimension of length.

This mean that q is a position..but position of what ??

Is a position of the wave ?
 

Answers and Replies

  • #2
vanhees71
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No, [tex]q[/tex] is not a position but a time-dependen amplitude. What you have written down there is a standing wave. To get the solution, you have to plug this ansatz into the wave equation. This will give a simple ODE for [tex]q(t)[/tex], which you should be able to solve easily.
 
  • #3
Born2bwire
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The arguments of the function are z and t. The spatially varying part of your wave is the sine function.
 

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