Coulomb's law says that electric field falls off like 1/z2. How can E for a uniformly charged disk depend on [1−z/R], or be independent of distance? Two very thin circular plastic sheets are close to...

Coulomb's law says that electric field falls off like 1/z2. How can E for a uniformly charged disk depend on [1−z/R], or be

independent of distance?

Two very thin circular plastic sheets are close to each other and carry equal and opposite uniform charge briefly why the

field between the sheets is much larger than the field outside. Illustrate your argument on a diagram.