What is the formula for calculating average power of electromagnetic waves?

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Homework Help Overview

The discussion revolves around the calculation of average power of electromagnetic waves, specifically focusing on the formula involving the maximum electric and magnetic fields.

Discussion Character

  • Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants explore the meaning of the variables in the formula for average power and question the necessity of solving within the cosine function. There is also a discussion about the relevance of maximum values in the calculation.

Discussion Status

Participants are sharing insights and clarifications regarding the formula and its components. Some have noted that the average power calculation is independent of frequency or position, indicating a productive exchange of information.

Contextual Notes

There is mention of specific values provided in the problem, such as the maximum electric field, which may influence the discussion but is not fully detailed.

blackbyron
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Homework Statement



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Homework Equations


Savg = Em * Bm / (2*μ0 * c)


The Attempt at a Solution


I solved for S avg without calculating inside the cos, but I got it right.

The z and t is given, but is there the reason why you don't solve inside the cos, or is it the bug? it's makes me confused.

Thanks
 
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Savg = Em * Bm / (2*μ0 * c)

What do Savg, Em and Bm mean?

ehild
 
I see, I look at my teacher's notes and saw the exact equation.

So to solve for Savg, it only cares about the maximum values right?
 
Right, the result is independent of frequency or position.
 
Thanks for your help.
 

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