Part A

A parallel$-$plate capacitor has a capacitance of $10$ mF and is charged with a $20-$ V power supply. The power supply is then removed and a dielectric material of dielectric constant $40$ is used to fill the space between the plates. What is the voltage now across the capacitor?

$2\mathrm{.}5$ V

$5\mathrm{.}0$ V

$20$ V

$80$ V

$10$ V

$q,$

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