Physics
posted by Anne .
Electric charge charge is distributed uniformly along a thin rod of length "a", with total charge Q. Take the potential to be zero at infinity find the potential at P. If z>>a, what would be the potential at p? From potential find the electric field at point p for z>>a.

Note:
P is located above the middle of a, a distance of z
P
(distance vertical z)
___________________
[a] 
http://web.mit.edu/8.02t/www/materials/StudyGuide/guide02.pdf
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