# Why do two ends of a long conducting wire have the same electric potential?

I am not seeing the "big picture" here. If I have two conducting spheres separated by a long conducting wire, why would the spheres share the same electric potential?

I think of the spheres as point charges, what does the conducting wire do? The $E$ field inside the conducting wire is 0, so what is it really doing?

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The sphere should be conductible, or you may face 1/0. –  puresky Jan 6 '12 at 3:53
Hi @puresky - it looks like you may have intended to comment on the question, so I converted your post into a comment. –  David Z Jan 6 '12 at 4:39