SOLVED: 'You have done the Wheatstone Bridge experiment using a power supply with emf Vo and a wire of length L and resistivity p and determined the balance point for unknown resistance Rx known resistance Rs, Which of the following will keep fixed the ratio of Lz/Ly?a: Changing the known resistance and fixing everything else: b: Varying the length or resistivity of the wire and keeping everything else the sameC Changing the unknown resistance and keeping everything else the samed. Changing the

A Wheatstone bridge is a type of "bridge circuit" used to make measurements of resistance. The unknown resistance to be measured, Rx, is placed in the circuit with accurately known resistances R1, R2, and R3 (Fig. 19-61 ) . One of these, R3, is a variable resistor which is adjusted so that when the switch is closed momentarily, the ammeter @ shows zero current flow. (a) Determine Rx in terms of R1, R2, and R3 .(b) If a Wheatstone bridge is "balanced" when R1=630 Ω, R2=972 Ω, and R3=42.6 Ω, what