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In a Wheatstone bridge, BALANCE condition gives:
AR₁R₂ = R₃R₄
BR₁/R₂ = R₃R₄
CR₁R₃ = R₂R₄
DR₁ + R₂ = R₃ + R₄
Answer & Solution
Correct answer: C. R₁R₃ = R₂R₄
Balance condition: P/Q = R/S (in standard notation). Equivalent to R₁R₃ = R₂R₄ depending on labelling. The key relation is cross-products of resistors are equal at balance.
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