spherical shell charge

Consider a spherical shell with inner radius r$1=0\mathrm{.}35$ m

and outer radius r$2=0\mathrm{.}95$ m$.$ The hollow inside the shell contains no charge; and charge is distributed on the inside surface of the shell and within the shell itself, such that the electrical field inside the shell itself is everywhere outward pointing and of uniform constant magnitude $38$ N$/$C$.$

$1\mathrm{.}0$p

$2$a

What is the charge per unit area on the inner surface at r $=$ r$1?$

$($Please answer in SI unit and multiply your answer by

$1$

$0$

$10$

$10$

$10$

$)$

Answer

$3\mathrm{.}36459$

Updated $5$ hours ago

$1\mathrm{.}0$p

$2$b

What is the charge per unit volume at radius r $=0\mathrm{.}8$ m $($within the material of the shell$)?$

$($Please answer in SI unit and multiply your answer by

$1$

$0$

$10$

$10$

$10$

$)$