A solid $($full$)$ insulating sphere of radius $$ has a uniform volume charge density $$

$(=$charge$/$volume$).$ Find the magnitude of the electric field $($a$)$ outside $(>)$ and $($b$)$

inside $(<)$ the sphere $($as a function of $).$

$4$

Reminder: Volume of sphere: $=$

$3$; Area of sphere $=42$

$.$