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22届全国中学生物理竞赛预赛第七题:三个电容器分别有不同的电容值C1、C2、C3,现把这三个电容器组成图示的(a)、(b)、(c)、(d)四种混联电路,试论证:是否可以通过适当选择C1、C2、C3的数值,使其中某两种混联电路A、B间的等效电容相等。解由电容C′、C″组成的串联电路的等效电容
The 22nd National Junior High School Physics Contest preliminary question No. 7: The three capacitors have different capacitance values C1, C2, and C3. These three capacitors are now composed of (a), (b), (c), and (d). ) Four kinds of mixed circuits, try to prove: whether through the appropriate choice of the value of C1, C2, C3, so that one of the two types of mixed circuit A, B equivalent capacitance. Solve the equivalent capacitance of the series circuit consisting of capacitors C’, C’’