Call your doctor at once if you have a serious side effect such as: 1  feeling short of breath, even with mild exertion; 2  swelling of your ankles or feet; 3  slow or uneven heartbeats; or. 4  numbness or cold feeling in your hands and feet.
For the most part, I understand the derivation; however, at the end of the derivation, the author adds one little condition: Where is the energy in a parallel plate capacitor actually stored? Well, if we think about it, the only place it could be stored is in the electric field generated between the plates..
Charged up to a voltage of V, the electric field is ##\frac{V}{d}## in a volume of ##Ad##. This gives a total energy content (of the electric field) of ##E=\frac{1}{2}\epsilon Ad \frac{V^2}{d^2}=\frac{1}{2} \frac{A}{d} V^2 = \frac{1}{2} CV^2## - which is exactly the energy stored in the whole capacitor.