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A parallel-plate capacitor with only air between the plates is charged by connecting it to a battery. The capacitor is then disconnected from the battery, without any of the charge leaving the plates.A voltmeter reads 50.0 V when placed across the capacitor. When a dielectric is inserted between the plates, completely filling the space, the voltmeter reads 10.0V .
PartA: What is the dielectric constant of this material?
K=
Part B: What will the voltmeter read if the dielectric is now pulled partway out so it fills only one-third of the space between the plates?
V= V
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