ā¬_(S)(1)/(r^(2))dS where S is that part of the cylinder x^(2)+y^(2)=a^(2) bounded by the planes z=0,z=
H(H>0), and r is the distance between the origin and a point on the surface of S.
5.dS where is that part of the cylinder x2+y=a2 bounded by the planes z=0,z= HH > 0)and r is the distance between the origin and a point on the surface of