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## Homework Statement

situation:

there are two charges (+q) one at one corner of an equilateral triangle the other at another corner. the triangle has sides length a.

what is the work required to bring another charge (+q) in from infinity to the other corner on the equilateral triangle.

## The Attempt at a Solution

ok so i know dW = -dU = F.dl

i thought that maybe finding (F) at the corner that we are bringing the charge to may help...this is:

F

_{c}[at corner] = q

^{2}/ 2*pi*epsilon*a

^{2}

then i could just integrate this over the distance i am moving it with respect to a...however i know that the one limit will be [tex]\infty[/tex] however i don't know what the other will be

thanks for any help

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