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Electric charge of a thin rod

by rasanders22
Tags: charge, electric
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rasanders22
#1
Feb15-11, 10:20 PM
P: 8
Electric 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 the following points: P is distance x from (0,0) which is the right side of the rod.

Find the potential at the point P, a distance to the right of the rod.
already answered

In part A, what does your result reduce to as x becomes much larger than a?
answer from A.
Q/a4pi(e0)(ln(x+a)-ln(x)

So as x becomes larger than a, (moves toward infinity)V should reduce to zero. The ln's should cancel eachother out, leaving you to multiply by 0. Except 0 is not excepted.
Ive tried
KQ(ln(x)-ln(x))
0
KQ0
According to the software, the answer depends on x, and does not depent on a.
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