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Electric field strength from a light bulb

  1. Feb 22, 2008 #1

    A90

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    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
    [tex]\vec{E}[/tex]=[tex]\frac{kq}{d^{2}}[/tex]

    P=[tex]\frac{2kq^{2}a^{2}}{3c^{3}}[/tex]

    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.
     
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