The Wheatstone network is used to determine unknown resistances. The metre bridge is an instrument based on the balancing condition of the Wheatstone network. The resistances R1 and R2 are two parts of a long wire PQ (usually 1 m long) (R1 = kL1, R2 = kL2) The portion PA of the wire offers resistance R1 and the portion QA offers resistance R2. The sliding contact at A is adjusted so that the galvanometer reads zero. In the no-deflection condition,
If R is a known resistance, then X can be measured by measuring the lengths L1 and L2.
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