positive charge of $Q=3.00\U{$\mu$C}$ uniformly distributed throughout
its volume. Concentric with this sphere is a conducting spherical
shell with inner radius $b=10.0\U{cm}$ and outer radius $c=15.0\U{cm}$
-as shown in Figure P24.51, having net charge $q=-1.00\U{$\mu$C}$.
+as shown in Figure~P24.51, having net charge $q=-1.00\U{$\mu$C}$.
Prepare a graph of the magnitude of the electric field due to this
configuration versus $r$ for $0<r<25.0\U{cm}$.
\end{problem*}