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## Homework Statement

its not a statement but i was wondering: i'm studying the electric potential and when we have a sphere with inner radious r1 and outer radious r2 that has a charge lets say +Q with a cavity and there is a point charge q inside this cavity so the inner surface will have -q and the outer will have Q+q

## Homework Equations

if i want to calculate the electric potential in the cavity and in the sphere between r2 and r1 and outside and on r1 and r2???

## The Attempt at a Solution

i think that inside there will be an electric feild so V=Kq/r where r is the distance from q

and between r1 and r2 E=0 so the difference must be zero and since there is no charges moving here we will say that through r2>r>r1 the same but how do i calculate it

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