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16. A balanced Wheatstone bridge consists of an RV of 3,500 Ω, an R2 of 200 Ω, and an R3 of 680 Ω. The value of RUNK is ________.
(a) 680 Ω
(b) 1,029 Ω
(c) 200 Ω
(d) 880 Ω
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