68. The glass plate (ε = 7,0) thickness d = 1.0 cm, and the area S = 100 cm2 is placed perpendicular to the field lines of a uniform electric field intensity E0 = 800 V / m. To determine the surface density σ 'related charges on the plate and the energy W of the electric field inside the plate.

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