In the Wheatstone bridge circuit shown in Fig. 1, the ratio R2/R1 can be set to the follow...

In the Wheatstone bridge circuit shown in Fig. 1, the ratio R2/R1 can be set to the following values: 0.001, 0.01, 0.1, 1, 10, 100, and 1000. The resistor R3 can be varied from 1 to 11,110 Ω, in increments of 1 Ω. An unknown resistor is known to lie between 4 and 5 Ω. What should be the setting of the R2/R1ratio so that the unknown resistor can be measured to four significant figures?

Figure 1