The voltage across an air-filled parallel-plate capacitor is measured to be 171.

Question

The voltage across an air-filled parallel-plate capacitor is measured to be 171.0 V. When a dielectric is inserted and completely fills the space between the plates as in the figure below, the voltage drops to 50.3 V.

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


Can you identify the dielectric?
---Select--- neoprene rubber bakelite paper teflon nylon

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

The voltage across an air-filled parallel-plate capacitor is measured to be 171.0 V. When a dielectric is inserted and completely fills the space between the plates as in the figure below, the voltage drops to 50.3 V. (a) What is the dielectric constant of the inserted material? Can you identify the dielectric? ---Select--- neoprene rubber bakelite paper teflon nylon (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

Q = CV

after dielectric:

Q = kCV'

V = kV'

k = 3.4

material is:

Nylon

if dielectric doesn't fill completely voltage will be more than it is for fully inserted.

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