[填空题]
The variable capacitanceyb5a6 :)z sf5et +ucmv of *9gtzkiqzz d 0m2bjq,/ix1f6 an old radio tuner consists of four plates connected together placed alternately between four other plates, also connected together (Fig. b/fkqx6z,1qd 2*gzi 9im tzj0Below). Each plate is separated 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
