A capacitor consists of two 6.6-cm-diameter circular plates separated by 1.0 mm. The plates are charged...
A capacitor consists of two 6.6-cm-diameter circular plates separated by 1.0 mm. The plates are charged to 170 V , then the battery is removed. How much energy is stored in the capacitor? How much work must be done to pull the plates apart to where the distance between them is 2.0 mm?
Homework Answers
Capacitance = Aeo / d
= pi*0.033^2 * 8.85*10^-12 / 0.001
= 3.02*10^-11 F
Energy = 0.5CV^2
= 0.5*3.02*10^-11*170^2
= 4.37*10^-7 J
Capacitance will be halfed when seperation is doubled and so Energy will also be halfed
so Work done = 4.37*10^-7 / 2= 2.18*10^-7 J
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