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Homework Help: Relating B and E in an electromagnetic wave

  1. Mar 25, 2010 #1
    1. The problem statement, all variables and given/known data

    I need to determine B(rms) in terms of E(max) given a standard E-M wave.

    2. Relevant equations

    E = cB

    3. The attempt at a solution

    I assumed that B(max) is sqrt(2) x B(rms) and then just plugged in for B(max) in the equation above. Am I right in assuming the rms value involves a square root? (I get confused if it's 2 or sqrt(2))
  2. jcsd
  3. Mar 25, 2010 #2


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    Gold Member

    You are right. The max value is greater than the rms value by a factor of sqrt(2).
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