일반물리학 2 — Gauss' Law: Problem 11

11 The volume charge density of a solid nonconducting sphere of radius R = 5.60 cm varies with radial distance r as given by $\rho = (35.4 \text{ pC/m}^3)r/R$. (a) What is the sphere's total charge? What is the field magnitude E at (b) r = 0, (c) r = R/3.00, and (d) r = R? (e) Graph E versus r.