Physics · Electrostatics

A uniform thin spherical shell of radius R has a uniform surface charge density σ. The electric field at a point P at a distance r (where r > R) from the centre of the thin shell is E. If the numerical values of radius R, surface charge density σ, electric field E, and distance r are all equal to a constant k, and the electric field expression is rewritten in terms of a constant q such that E = q σ R2ε0 r2, then what is the value of q?