A spherical surface completely surrounds a collection of charges. Find the electric flux (with its sign) through the surface if the collection consists of (a) a single $+5.60 \times 10^{-6}$ C charge, (b) a single $-7.00 \times 10^{-6}$ C charge, and (c) both of the charges in (a) and (b).
(a) Number
Units
(b) Number
Units
(c) Number
Units