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## Homework Statement

An infinitely long, non-conducting cylinder of radius R carries a uniform volume charge density ρ. Find the magnitude of the electric field for 0 < r < R

## Homework Equations

EA=Qin/εo

## The Attempt at a Solution

I am debating whether the answer should be ρr^2/2εoR or ρr/2εo.

I said E(2πRL)=(ρπr^2L)/εo and solved to get ρr^2/2εoR.

I was confident in my answer but then found the same problem in the book, but it asked to find E at distance r from axis, where r<R. The answer to this was ρr/2εo. Can someone explain the difference between these two problems, if there is one. They may be exactly the same and my calculation is wrong, but I am confused over the two