D$2\mathrm{.}4.$ Calculate the total charge within each of the indicated volumes: $($a$)0\mathrm{.}1|$x$|,|$y$|,|$z$|0\mathrm{.}2$: v $=$ x$3$ y$3$ z$3$ ; $($b$)0$ $0\mathrm{.}1,0$ $,2$ z $4$; v$=$ $2$z$2$ sin $0\mathrm{.}6$; $($c$)$ universe: v$=$ e$2$r$/$r$2.$ Ans. $($a$)0$; $($b$)1\mathrm{.}018$ mC; $($c$)6\mathrm{.}28$ C