calculate the electric flux through the curved surface and base of a right hollow cone of height h and base radius r when charge q is placed at its vertex?

Answer 1

Electric flux through the sphere with the point charge in its center is
Φ = q/ε₀, the area of this sphere is A = 4πr².
If the area of the spherical segment is A1=2πr(r-h)
Then, from the proportion:
q/ε₀ ….. 4πr².
Φ1 ……2πr(r-h),
the electric flux through the spherical segment is
Φ1=q{1-(h/r)}/2ε₀