College Physics Quiz
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DC CIRCUITS
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A student builds a circuit to measure an unknown resistance RxR_x using a Wheatstone bridge configuration. The bridge uses known resistors: R1=100 ΩR_1 = 100\,\Omega, R2=150 ΩR_2 = 150\,\Omega, and R3=200 ΩR_3 = 200\,\Omega. When the bridge is balanced (zero current through the galvanometer), what is RxR_x, and what happens to the bridge balance if R1R_1 is increased to 120 Ω120\,\Omega?
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