An air$-$filled parallel$-$plate capacitor is connected to a voltage source until it is fully charged. The voltage source is disconnected leaving the charge on the capacitor plates.

Holmes,$$Tim$-$trh$5605$@psu.edu

trh$5605$@psu.edu$0$P$65-85-39-40-$BD$61-52485$

$-$ Part $($a$)$

A voltmeter indicates that the voltage across the charged capacitor is $44\mathrm{.}2$VV$.$ When a dielectric material is inserted between the plates completely filling the gap, the reading on the voltmeter drops to $18\mathrm{.}4$VV$.$ What is the dielectric constant of the dielectric material?

$=2\mathrm{.}4002\mathrm{.}400$Correct$!$

$$ Part $($b$)$

If the dielectric material is slowly extracted until it fills only $35\%\%$ of the gap, then what is the reading, in volts, on the voltmeter?