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Homework Help: Thomson's Apparatus

  1. Oct 16, 2012 #1


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    1. The problem statement, all variables and given/known data

    The question at the top of this PDF is kinda confusing me... I follow it all the way up until it says

    [itex]sin\theta \approx \theta \equiv \frac{l}{r} \Rightarrow r \approx \frac{l}{\theta}[/itex]

    3. The attempt at a solution

    The book I'm using has an identical question (same values even) as this one, but it refers me to "Figure 4.6" which is supposed to be a diagram of the Thomson apparatus in question, but it's not in the book as far as I can tell. I did find a diagram of the apparatus at the beginning of the chapter with a somewhat similar example, (except the book uses tan(theta), and no magnetic field, only uses the electric field) but I'm wondering why we are using sine in the PDF.
  2. jcsd
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