i just typed out my response and realised something. i couldnt see the difference between the formula i gave and the formula u gave but now i think i see it.
so by the sounds of it, it doesnt matter where you place the charge Q inside the sphere, E outside the sphere depends on the position...
lol, thanks for the responses guys, very much appreciated
but i'm still completely stumped by the question
just to make it clear i want to find an expression for the electric field outside the sphere (after reading my first post i didnt think my question was very clear)
if u have an uncharged,perfectly conducting hollow sphere of thickness t and radius R, and a point charge Q is placed a distance D from the centre of the sphere so that R-t>D, what would the electric field, E, be?
i just treated it the same as if Q was in the centre of the sphere and the...