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E fields from charged rods

  1. Nov 21, 2006 #1
    now, i have absolutely no idea what the heck that means, and doubt i ever will, but my boyfriend is doing a dgree in electronic engineering and is studying fields and devices at the moment and is really stuck so i was wondering if anyone could help!!!

    His notes say "the total e field is the vector sum over all the N charges. If we line up our axes so that the charges are on the x axis then we get..."
    a really long equation. (i would write it here, but theres no way to get all the equations symbols!)

    THe equation has a x' in it, and he has no idea what the notation means.

    im probably not making any sense to anyone, but i just wanted to see if i could help him (im studying for a law degree so this is all spanish to me!)

    thanks so much,

  2. jcsd
  3. Nov 21, 2006 #2


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    Science Advisor
    Gold Member

    Often a primed variable is used to indicate the position of a source while an unprimed variable is the observation point. Why not have your boyfriend post his question here?
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