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Homework Help: Electric and Magnetic field relationship

  1. Oct 26, 2007 #1
    1. The problem statement, all variables and given/known data
    Show that B = (k)v(cross)E

    3. The attempt at a solution
    I have no idea where to start. I have the F = qE and F = q(v(cross)B)
  2. jcsd
  3. Oct 28, 2007 #2
    Just a starting point would be much help.
  4. Oct 28, 2007 #3


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    Homework Helper

    did you post the question exactly?

    Is the question asking to prove that in general:

    [tex]B = k\vec{v}\times\vec{E}[/tex]

    I don't recognize this relationship... is this for a specific situation?
  5. Oct 28, 2007 #4
    That is the first part of the problem.

    Show that [tex]\vec{B} = k\vec{v}\times\vec{E}[/tex]

    Find the fundamental units of k, which I believe I have correct as [tex]m^2/s^2[/tex]

    Find [tex]\vec{B}[/tex](dot)[tex]\vec{E}[/tex]

    Find [tex]\vec{E}\times\vec{B}[/tex]

    I believe with the 1st part I can figure the rest out. I just don't know where to start to prove the first part.
  6. Oct 28, 2007 #5


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    In general? Or for a specific situation?
  7. Oct 28, 2007 #6
    In general.
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