Energy density of a capacitor

jeudi 30 janvier 2014

1. The problem statement, all variables and given/known data



A parallel-plate capacitor with C = 16 mu or micro FF is charged so as to contain 1.7 J of energy. If the capacitor has a vacuum between plates that are spaced by 0.35 mm, what is the energy density (the energy per unit volume)?



I am a little lost of this problem and have no idea if I'm doing it correctly. Am I ?



2. Relevant equations

v = A*d

E,density=U/v





3. The attempt at a solution

v=16e-3/.35e-3=45.71

E=1.7/45.71=.0371 J/m^3





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