The voltage across an air-filled parallel-plate capacitor is measured to be V 1

Question

The voltage across an air-filled parallel-plate capacitor is measured to be V1 =104.0 V. When a dielectric is inserted and completely fills the space between the plates, as in the figure below, the voltage drops to V2 =30.6 V.

(a) What is the dielectric constant of the inserted material?


Can you identify the dielectric? (Choose one)

-neoprene rubber

-nylon

-bakelite

-teflon

-paper

(b) If the dielectric doesn't completely fill the space between the plates, what could you conclude about the voltage across the plates?

Explanation / Answer

(A) charge on capacitor will no change .

Q = C1 V1 = C2 V2

C1 ( 104) = C2 (30.6)

C2 / C1 = 3.40

and k = C2 / C1 = 3.40

(b ) This is nylon.

(c) Voltage will be less then 104 Volt but more than 30.6 Volt.

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