$.$ Given the following values for P$1,$ P$2,$ and I$1$L$1,$ calculate $$H$2$: $($a$)$ P$1(0,0,2),$ P$2(4,2,0),2$ az$$A $$ m; $($b$)$ P$1(0,2,0),$ P$2(4,2,3),2$ az$$A $$ m; $($c$)$ P$1(1,2,3),$ P$2(3,1,2),2$$($ax $+$ ay $+2$az$)$A $$ m$.$

Ans. $($a$)8\mathrm{.}51$ax $+17\mathrm{.}01$ay nA$/$m; $($b$)16$ay nA$/$m; $($c$)18\mathrm{.}9$ax $33\mathrm{.}9$ay $+26\mathrm{.}4$az nA$/$m