GATE 2025 IN – Question 45
The bridge in Figure (a) has the equivalent circuit in Figure (b). The values of $R_1$, $R_2$, and $V_C$ are
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Correct answer: (C) R1 = 2 kΩ, R2 = 2 kΩ, and VC = 9 V
Explanation
Unloaded node voltages are VH=18×6/(3+6)=12 V and VL=18×3/(6+3)=6 V.
Their midpoint/common-mode voltage is 9 V, with ±3 V offsets.
With the supply shorted, each node sees 3k||6k=2 kΩ.
Therefore **R1=R2=2 kΩ, VC=9 V, C**.