my first part it like that as we all know that flux density is the charge per unt area here charge is 60uc so divide 60uc by (4*pi*r2) we get D= 7.06*10^-5 c/m2
NOW given is portion with r=26cm theta= 0 to pi/2 and phi = 0 to pi/2
calculate required region area with formula =double integral(r^2sintheta dtheta dphi)
we get =.106m^2 now multiply D*Required region we get 7.5uc
