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The positively charged plate of a parallel-plate capacitor has a charge equal to Q. When the space between the plates is evacuated of air, the electric field strength between the plates is 3.5 105 V/m. When the space is filled with a certain dielectric material, the field strength between the plates is reduced to 1.5 105 V/m.

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

(b) If Q = 19 nC, what is the area of the plates?

cm2

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