A nonconducting sphere has radius R $=2\mathrm{.}33$ cm and uniformly distributed charge q $=+5\mathrm{.}50$ fC$.$ Take the electric potential at the sphere's center to be V$0=0.$

$($a$)$ What is V at radial distance r $=1\mathrm{.}45$ cm$?$

V

$($b$)$ What is V at radial distance r $=$ R$?$

V