Question : Two large, thin metal plates are parallel and close to each other. On their inner faces, the plates have surface charge densities of opposite signs and of magnitude 17.0*10^-22. What is E (Electric field) : (a) in the outer region of the first plate, (b) in the outer region of the second plate? Answer: According to the book, answers are (a) 0 (b) 0 And the reason they've given is - "Net electric field is Zero because electric fields due to both the plates will cancel out each other". My objection : How? How do they cancel each other's effect when that particular region is NOT EQUIDISTANT from each other, and as Electric field varies inversely with the square of distance, HOW ARE THEY EQUAL IN MAGNITUDE?