Choose the correct circuit which can achieve Wheatstone bridge balance. The four diagrams show 10 Ω, 10 Ω, 15 Ω and 5 Ω arms with diode D and cell connections. [Diagram: Image]
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Choose the correct circuit which can achieve Wheatstone bridge balance. The four diagrams show 10 Ω, 10 Ω, 15 Ω and 5 Ω arms with diode D and cell connections. [Diagram: Image]

G1 Physics · Accepted Answer

Step 1: For Wheatstone balance P/Q = R/S, and galvanometer current zero. Step 2: The diode orientation determines the effective resistance path: it must be correctly biased in the appropriate branch for balancing. Step 3: Compare cell polarity and diode directions in the original four diagrams; the source indicates D.