A 5-µF, a 7-µF, and an unknown capacitor CX are connected in series between points a and b. What do you know about the equivalent capacitance Cab between a and b? (There could be more than one correct choice.)
A) 5 µF < Cab < 7 µF
B) Cab < CX
C) Cab > 12 µF
D) Cab < 5 µF
E) 5 µF < Cab < 12 µF
B, D
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a. 8600 years c. 11,500 years b. 4460 years d. 17,200 years
If bulb C were unscrewed: _________
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Indicate whether the statement is true or false