Part A

A parallel$-$plate capacitor is constructed with circular plates of

radius $6\mathrm{.}40{10}^{-2}m.$ The plates are separated by $0\mathrm{.}30mm,$

and the space between the plates is filled with a dielectric with

dielectric constant $.$ When the charge on the capacitor is $1\mathrm{.}9C$

the potential difference between the plates is $1020V.$

Find the value of the dielectric constant, $.$

Express your answer using two significant figures.

$=|,$