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1. a) State clearly the balanced condition of Wheatstone bridge.

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Wheatstone bridgecircuit diagram. The unknown resistanceRxis to be measured; resistancesR1,R2andR3are known andR2is adjustable. If the measured voltageVGis 0, thenR2/R1=Rx/R3.

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AWheatstone bridgeis anelectrical circuitused to measure an unknownelectrical resistanceby balancing two legs of abridge circuit, one leg of which includes the unknown component. The primary benefit of the circuit is its ability to provide extremely accurate measurements (in contrast with something like a simplevoltage divider).[1]Its operation is similar to the originalpotentiometer.

The Wheatstone bridge was invented bySamuel Hunter Christiein 1833 and improved and popularized by SirCharles Wheatstonein 1843. One of the Wheatstone bridge's initial uses was for the purpose ofsoils analysisand comparison.[2]



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