Our table$-$top Van deGraaff generator's $($spherical$)$ dome diameter is $250$ mm; the mini$-$pie tin mass is $0\mathrm{.}434$ gram $[$not kg$!],$ and a $0\mathrm{.}00273$ m$\mathrm{²}$ Area. 

 

$\{$ a$)$ What electric Force was needed to levitate the pie$-$tin? $\}$

$\{$ b$)$ What fraction of the VdG dome's charge was on the pie$-$tin?

c$)$ How much charge was on the big VdG dome when the pie$-$tin was lifted off the dome?