Question

When a Wheatstone bridge is said to balanced. ?? Plz give a clear cut answer. ​

Answer 1

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We have seen above that the Wheatstone Bridge has two input terminals (A-B) and two output terminals (C-D). When the bridge is balanced, the voltage across the output terminals is 0 volts. When the bridge is unbalanced, however, the output voltage may be either positive or negative depending upon the direction of unbalance.

Answer 2

IN NORMAL CONDITION, THE BRIDGE REMAINS IN THE UNBALANCED CONDITION, I.E. THE CURRENT FLOW THROUGH THE GALVANOMETER. WHEN ZERO CURRENT PASSES THROUGH THE GALVANOMETER, THEN THE BRIDGE IS SAID TO BE IN BALANCED CONDITION. THIS CAN BE DONE BY ADJUSTING THE KNOWN RESISTANCE P, Q AND THE VARIABLE RESISTANCE S.

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