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## Homework Statement

two infinitely large plates are at a distance d from each other .they carry a unifor surface charge of densities X and -X.the plates have round coaxial holes of radius R.with d<<R.find the electric field through the axis of the holes(taking them as circles) as a function of distance l from them.[/B]

## Homework Equations

## The Attempt at a Solution

i think i should find the field due to both the plates and subtaract the field due to the hole.i don't exactly know how to do that if that's how it done.