F = . Without doing any calculations determine whether the flux across each sphere is positive, negative or zero. (a) Sphere with radius 2 and center at the origin. (b) Sphere with radius 1 and...

F = <0, 1,="" z=""> . Without doing any calculations determine whether the flux across each sphere is
positive, negative or zero.

(a) Sphere with radius 2 and center at the origin.

(b) Sphere with radius 1 and center at (1, 2, 3)

(c) Sphere with radius 1 and center at (3, –2, 1).