In a parallel planar electrode system shown in Figure 2 with an electrode opening a = 15 mm, U = 72 kV between electrons is applied

In a parallel planar electrode system shown in Figure 2 with an electrode opening a = 15 mm,

U = 72 kV between electrons is applied. (?0 = 8,854.10-12 F / m).

a) Before inserting the glass piece between electrons, only the puncture strength Edhava = 30 kV / cm

If there is air, calculate the electric field strength in the system. (5p)

b) On top of the bottom electrode 10 mm thick, puncture resistance Edcam = 100kV / cm and ?r2

If a piece of glass with (glass) = 4 is put, the glass layer and the remaining 5 mm

the voltages (in KV) falling on the air layer with a thickness of r1 = 1 and the electric field

Calculate their strength (in KV / cm). (10p)

c) The surface areas of the plane electrodes as S = 60cm2, the capacity of the two-layer system

calculate.