Consider a rod of length \(\ell\) that carries a uniform charge distribution. Is Gauss's law practical for calculating the electric field at a radial distance \(r\) from the midpoint of the rod's length

(a) when \(r \ll \ell,(b)\) when \(r=\ell\), and

(c) when \(r \gg \ell\) ? For each case in which your answer is yes, describe the shape of the most useful Gaussian surface.