(Solved): An infinite cylinder of radius R has a linear charge density . The volume charge density (C/m3) ...

An infinite cylinder of radius $R$ has a linear charge density $?$. The volume charge density $\left(\mathrm{C}/{\mathrm{m}}^3\right)$ Use Gauss's law to find an expression for the electric field $E$ inside the cylinder, $r?R$, in terms of $?$ and $R$. within the cylinder $(r?R)$ is $?(r)=r{?}_0/R$, where ${?}_0=3?/2?R^2$. Express your answer in terms of the variables $r,R,?$, and ${?}_0$.