An isolated conductor of arbitrary shape has a net charge of $+1\mathrm{.}7$ x $105$ C$.$ Inside the conductor is a cavity within which is a point charge q $=+3\mathrm{.}2$C $($a$)$ What is the charge on the cavity wall? $($b$)$ What is the charge on the outer surface of the conductor? $($a$)($b$)$ A$.2\mathrm{.}02$ x $10-5$ C $3\mathrm{.}20$ x $10-6$ C B$.-3\mathrm{.}20$x $`10-6$ C $2\mathrm{.}02$ x$10-5$ C C$.4\mathrm{.}04$ x $10-5$ C $6\mathrm{.}40$ x $10-6$ C D$.6\mathrm{.}40$ x $10-6$ C $4\mathrm{.}04$ x $10-5$ C E$.01\mathrm{.}38$ x $10-5$ C