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_{R2}of balanced bridge=V

_{R2 }of unbalanced bridge?

I was trying to solve a problem that required qualitative analysis. It says V

_{R2 }does not change even though the bridge is unbalanced. How???

The Bridge Balance eqn is R1/R2 = R3/R4, where R4 is the variable resistor. At balanced condition, V

_{R2}= V

_{R4}