68. (a) Here Dis not attached to anything, so that the 6Cand 4Ccapacitors are in series (equivalent to 2.4C). This is then in parallel with the 2Ccapacitor, which produces an equivalence of 4.4C. Finally the 4.4Cis in series with Cand we obtain CCCCCCeqF=+==b gbg4 44 408241...µwhere we have used the fact that C= 50 µF. (b) Now, Bis the point which is not attached to anything, so that the 6
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