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MCQ
In a Wheatstone bridge, if P = 10 Ω, Q = 20 Ω, and R = 15 Ω, the value of S at balance is:
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A 10 Ω
B 20 Ω
C 30 Ω
D 40 Ω
Explanation

P/Q = R/S → 10/20 = 15/S → S = 30 Ω

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