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Homework Help: Electric and Magnetic fields at one point on an electromagnetic wave

  1. Oct 30, 2012 #1
    At one instant, the electric and magnetic fields at one point of an electromagnetic wave are
    E = (210 + 320 − 40) V/m and B = B0(7.5 − 7.5 + a) μT. Find a and B0


    3. The attempt at a solution

    So I found a using E dot product B = 0 and I got the value a=-20.625 and this is correct.

    Next I tried find B0 using E=cB. Using only the i components, 210=(c)(B0)(7.5E-6) I got the answer B0=.0933 but smartphysics won't accept this.

    Am I missing something? Also why do I use the i component, which is related to the direction of the wave, rather than using the k component, which is related to the magnetic field?

    Thanks in advance
  2. jcsd
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