Chapter 2, Problem 2.103P

The Wheatstone bridge shown in Figure 2.66has vs=10 V,R1=10 k $\Omega$ ,R2=10 k $\Omega$ , and Rx=5932 $\Omega$ . The detector can be modeled as a 5k $\Omega$ resistance

1. What value of R3 is required to balance the bridge?

Suppose that R3 is 1 $\Omega$ higher than the value found in part (a) Find the current through the detector [Hint: Find the Thévenin equivalent for the circuit with the detector removed Then, place the detector across the Thévenin equivalent and solve for the current.] Comment.