A long cylindrical conductor $($radius $=1\mathrm{.}0$ mm$)$ carries a charge density of $+8$ pC$/$m and is inside a coaxial, hollow, cylindrical conductor $($inner radius $=3\mathrm{.}0$ mm$,$ outer radius $=5\mathrm{.}0$ mm$)$ that has a total charge density of $-3$ pC$/$m$.$

What is the magnitude of the electric field $2\mathrm{.}0$ mm from the axis of these conductors?

Answer for part $1$

What is the magnitude of the electric field $4\mathrm{.}0$ mm from the axis of these conductors?

Answer for part $2$

What is the magnitude of the electric field $8$ mm from the axis of these conductors?