Understanding the Voltage Changes in an Unbalanced Wheatstone Bridge

[msslowlearner]

In an unbalanced Wheatstone Bridge, does the voltage across the resistors R1 and R2 change? In other words is V_R2of 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

 

[msslowlearner]

sorry. I've asked this question again in the HW-CW section. Pls do not reply to this post here.