A parallel- plate,air-gap capacitor has a capacitance of 28 pF. The platesare se

Question

A parallel- plate,air-gap capacitor has a capacitance of 28 pF. The platesare separated by 1.2mm. (1 pF = 1 x 10-12F, 1 mm = 1 x10-3m)

a. What is the area of each plate? b. What is thecharge on each plate if the potential difference is 75V? c. How much energyis stored in the capacitor in this condition? d. What is the magnitude of theelectric field between the plates of this capacitor? A parallel- plate,air-gap capacitor has a capacitance of 28 pF. The platesare separated by 1.2mm. (1 pF = 1 x 10-12F, 1 mm = 1 x10-3m)

a. What is the area of each plate? b. What is thecharge on each plate if the potential difference is 75V? c. How much energyis stored in the capacitor in this condition? d. What is the magnitude of theelectric field between the plates of this capacitor?

Explanation / Answer

use the formulae c =A/d where  =ok you will get area A=cd/ =0.0038m2 and for charge use q=cv so q=21*10-10 coloumbs Energy =q*q/2c =7.87*10-8 J and E=v/d =6.25*104

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