An air$-$filled capacitor is made from two flat parallel plates $1\mathrm{.}2$ mm apart. The inside area of each plate is $7\mathrm{.}6$ cm$2.$

$($a$)$

What is the capacitance of this set of plates $($in pF$)?$

pF

$($b$)$

If the region between the plates is filled with a material whose dielectric constant is $5\mathrm{.}4,$ what is the new capacitance $($in pF$)?$

pF