69. The potential difference between the plates of a flat capacitor is 280 V. The surface charge density on the plates is 4.95 ∙ 10−11 C / cm2. The area of each plate is 100 cm2. Find: 1) the field strength inside the capacitor; 2) the distance between the plates; 3) the speed that the electron will receive, having passed in the capacitor the path from one plate to another.

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