A Wheatstone bridge circuit consists of four arms of which two arms consist of known resistances while the other two arms consist of an unknown resistance and a variable resistance. The circuit also consists of a galvanometer and an electromotive force source. The current that flows through the galvanometer depends on the potential difference across it. When the ratio of any two adjacent resistances is equal to the other pair then PD across Galvanometer is zero. Hence, no current flows through the galvanometer. galvanometer can be replaced by any resistance but the current will not pass through

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