Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Electric Field of an EM wave

  1. Mar 14, 2010 #1
    1. The problem statement, all variables and given/known data
    A 1.10m long FM antenna is oriented parallel to the electric field of an EM wave. How large must the electric field be to produce a 1.28 mV voltage between the ends of the antenna?


    2. Relevant equations
    u = EoErms^2
    I = uc
    Intensity = Power / area

    3. The attempt at a solution
    I found u to be 1.45E-17 using E0 and Erms of .00128V
    Then I found I to be 4.35E-9
    Then I found P to be 1.65E-8

    I'm not sure I'm using the right equations to find the electric field, I don't really know what variable represents it?
     
  2. jcsd
  3. Mar 14, 2010 #2

    ideasrule

    User Avatar
    Homework Helper

    How about using the equation V=E*d?
     
  4. Mar 14, 2010 #3
    yep, that's a lot easier. oops. thanks!!
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook