12. The space between the round plates (whose radius r = 2 cm) of the flat capacitor is filled with a dielectric (ε = 3) with a thickness of d = 1.5 mm. The capacitor is charged to a voltage of U = 1 kV. Determine: 1) the electric capacity of the capacitor; 2) the charge Q on the plates; 3) the energy W of the electrostatic field; 4) the bulk energy density ω of the capacitor field.

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