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29. Two series capacitors (one 2 μF, the other of unknown value) are charged from a 24 V source. The 2 μF capacitor is charged to 16 V and the other to 8 V. The value of the unknown capacitor is ________.
(a) 1 μF
(b) 2 μF
(c) 4 μF
(d) 8 μF
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