[填空题]
The variable capacitance oaui* pl3b fg.bs (*t9kdj l*z(f an old ww2mu n:e8t3t radio tuner consists of four plates connected together placed alternately between four other plates, also connected together (Fig. Below). Each plate is 3 t:m w2tunwe8separated from its neighbor by 1.5 mm of air. One set of plates can move so that the area of overlap of each plate varies from $2.0cm^2$ to $9.5cm^2$
(a) Are these seven capacitors connected in series or in parallel?
(b) Determine the range of capacitance values. from pF to pF
