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9. In a certain three-branch parallel circuit, R1 has 12 mA through it, R2 has 15 mA through it, and R3 has 25 mA through it. After measuring a total of 27 mA, you can say that ________.
(a) R3 is open
(b) R1 is open
(c) R2 is open
(d) the circuit is operating properly
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- 5555555555 8. In a five-branch parallel circuit, there are 12 mA of current in each branch. If one of the branches opens, the current in each of the other four branches is ________. (a) 48 mA (b) 12 mA (c) 0 A (d) 3 mA