It is an arrangement of four resistances P, Q, R and S connected as shown. Their values are so adjusted that the galvanometer G shows no deflection. The bridge is then said to be balanced. When this happens, the points B and D are at the same potential and it can be shown that
This is called the balancing condition. If any three resistances are known, the fourth can be found.
In the network, the cell arm and the galvanometer arm are interchangeable.
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