1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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 strength from a light bulb

  1. Feb 22, 2008 #1


    User Avatar

    1. The problem statement, all variables and given/known data
    What is the approximate electric field strength of the electromagnetic waves radiated by a 100-W light bulb, measured 3.0m from the bulb?

    2. Relevant equations


    3. The attempt at a solution
    I solved for q=[tex]\sqrt{\frac{3Pc^{3}}{2ka^{2}}}[/tex], and then plugged that into the equation for electric field, and I have all the values I need to solve except for the acceleration, which I'm not sure how to find. I thought about using the second derivative of x(t)=xsin[tex]\omega[/tex]t, but I don't know what to use for x, [tex]\omega[/tex] or t.
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted