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