b$.$ A $2\mathrm{.}0cm2\mathrm{.}0cm$ parallel$-$plate capacitor has a $0\mathrm{.}5$ mm spacing between the plates $($with only air between the plates$).$ The plates are connected by a $100$ V battery and the capacitor has fully charged.

i$.$ What is the capacitance of this parallel$-$plate capacitor?

ii$.$ What is the charge on each electrode$/$plate$?$