52. The flat plates of an air capacitor a potential difference U1 = 500V. Square plates S = 200 cm2. Spacing d1 = 1,5 mm. The plates are moved apart to a distance of d2 = 15 mm. Get the energy W1 and W2 before and after the capacitor plates razdvizheniya. If the source voltage to the extendable 1) disconnected; 2) turning off.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)