Question
A circular disc of radius 𝑅 carries surface charge density σ(r)=σo(1−rR),where σo is a constant and r is the distance from the center of the disc. Electric flux through a large spherical surface that encloses the charged disc completely is ϕ0 . Electric flux through another spherical surface of radiusR4 and concentric with the disc is ϕ.Then the ratio ϕ0ϕ is