Electrostatics || A cone charged unifomly, find intensity

[Ciumko]

Homework Statement

A cone of height H and base radius A is charged with charge Q uniformly distributed in all its volume. Find electrostatic field intensity at the top of the cone.

DATA: H, A, Q

Homework Equations

E=ρ/(4πε₀) ∫_Ω dΩ/R²)

and R is a vector (rr^+zz^) r^ and z^ are versors

The Attempt at a Solution

Don't have idea how to integrate this, hope anyone can help me.

 

[haruspex]

Use cylindrical coordinates. This gives you a triple integral.

 

[Ciumko]

How do I do this?

 

[haruspex]

How do I do this?

Are you familiar with cylindrical coordinates?
Do you know how to write an integral over a volume using such?
Both topics can be easily found on the net.