Given a 60-µC point charge located at the origin, find the total electric
flux passing through: (a) that portion of the sphere r = 26 cm bounded by
0 <θ<
π
2
and 0 <φ<
π
2 ; (b) the closed surface defined by ρ = 26 cm and
z = ±26 cm; (c) the plane z = 26 cm