(Solved): #physics #electricfield #electric Infinite leagth (lb) of a conducting solid cylinder of mdius a ...

Infinite leagth $(l?b)$ of a conducting solid cylinder of mdius $a$ and a conducting cylindrical shell of radias $b$ are placed coaxially (where $b>a$ ). Solid cylinder has uniform linear charge density $+?$ and the cylindrical shell has uniform surface charge density $+?$. What is the clectric field (in magnitude) $E(r)$ for $r>b?(k$ : Coulomb's constant) $(8\mathrm{pts})$ $2k(2+?2?b)/r^2$ b. $k(?+?2?b)/r$ $2k\left(?+??b^2\right)/r$ $2k(?+a2k(b?a))/r$ $2k(?+?2?b)/r$