Understanding Gauss's Law and Solving for E(P) and phi(P)

[lidl]

http://www.twiddla.com/188165
R and Q are given



E(P)=?
phi(P)=?

The Attempt at a Solution

Homework Statement

Homework Equations

I have no idea. I managed to do phi=E*2pi*r*h

 

[fluidistic]

http://www.twiddla.com/188165
R and Q are given



E(P)=?
phi(P)=?

The Attempt at a Solution

Homework Statement

Homework Equations

I have no idea. I managed to do phi=E*2pi*r*h

Welcome to PF!
Could you be more specific? What is R for instance? What is P? What are you looking for?

 

[lidl]

Welcome to PF!
Could you be more specific? What is R for instance? What is P? What are you looking for?

sorry for this R! mistake.

now i am looking only for the electric potential (sigma) at the point P!

 

[fluidistic]

sorry for this R! mistake.

now i am looking only for the electric potential (sigma) at the point P!

I don't see any point P on the picture. What is the configuration of charges?