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Homework Help: Electric field caused by a uniform linear charge

  1. Dec 2, 2008 #1
    A uniform linear charge density of [tex]\lambda[/tex] = 2.0 nC/m is distributed along the x-axis from x = 0 to x =3m. Which integral is correct for the magnitude of the electric field at x = -4 m on the x axis?

    I'm going over a old test and he didn't circle the correct answer but I'm trying to understand the denominator.

    I'm pretty sure I have everything but the denominator, would it be [tex]\int[/tex][tex]\frac{18dx}{(4+x)^{2}}[/tex] from 0 to 3?
  2. jcsd
  3. Dec 2, 2008 #2


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    Looks okay, except that you did not write any of the units.
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