A solid nonconducting sphere of radius R has a nonuniform charge distribution of volume charge density p $=$ Kr$2,$ where K is a positive constant and r is radial distance from the sphere's center. NOTE: Express your answers in terms of the given variables, using eo when needed. $($a$)$ Determine an expression the magnitude E of the electric field for $0<$ r $<$ R$.$

E$=$

Kr$3$

$50$

$($b$)$ Determine an expression the magnitude E of the electric field

for r $>$ R$.$

E$=1$

Kr$5$

$5$or$2$