Unbalanced Wheatstone Bridge

In an unbalanced Wheatstone Bridge, does the voltage across the resistors R1 and R2 change? In other words is VR2of balanced bridge=VR2 of unbalanced bridge?

I was trying to solve a problem that required qualitative analysis. It says VR2 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, VR2 = VR4
 
sorry. I've asked this question again in the HW-CW section. Pls do not reply to this post here.
 

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