The energy density within a parallel plate capacitor is u $=2\mathrm{.}61016$ J$/$m$3.$ The plates

are circular with a radius of $5\mathrm{.}1$ cm$,$ and the plates are spaced $0\mathrm{.}35$ mm apart. $($The

permittivity of free space is $0=8\mathrm{.}8541012$ C$2/$N$$m$2.)$

$($a$)$ What is the capacitance of the the parallel plate capacitor?

$($b$)$ What is the potential across the parallel plate capacitor?

$($c$)$ What is the charge on the parallel plate capacitor?