What is Wheatstone bridge

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a wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of a bridge circuit , One leg of which consists the unknown component

In figure R4 is fixed and the R2 is variable resistor . The R2 is adjusted untill the bridge becomes balanced and no current flows through the galvanometer . at this point voltage between B and D will be 0 . Therefore R2/R1=R4/R3

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