Probtems 91 Figure P3.65 a) For the circuit shown in Fig. P3.66 rhe bridge is balanced when AR = 0. Show that if A-R << R,the bridge output voltage is approximately -An&U^=-r),-" (R,+ R4r -b) Given R, : 1 kO, R3 : 500 O, n4 = 5 kO, andoin - 6 V, what is the approximate bridge out-put voltage if AR is 3olo of Ro?c) Find the actual value of 1'" in part (b).Figure P3.66show that the percent elror in the approxima- tion of o, in koblem3.66 is /A P\P.o/o enor = -::il:i:- . 100. b) Calculate the perce error in od, using the values h Problem 3.66(b).Assume the eror in t'd in the bridge circuit inFig. P3.66 is not to exceed 0.5%.What is tlle largestpercent change in Ro that can be tolerated? 3.69 a) Derive Eq.3.65.,:lNfl[ii, b) Dedve Eq.3.68. 3.70 Derive Eq.3.70.3,fl Suppose the grid structure in Fig.3.36 is 1 m wideand the veitical displacement
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