posted by Paige .
A parallel-plate capacitor consists of two square plates 18 Cm on a side, spaced 0.50 mm apart with only air between them. What is the maximum energy that can be stored by the capacitor?
Figure capacitance. Use your formula.
Then figure the maximum voltage that can be on the plates in dry air (consider breakdown voltage of air, and spacing).
Then, Energy= 1/2 C V^2
Let me know if you have a problem on this.