Which of the expressions is true for the balanced condition of the following wheatstone bridge?
Wheatstone bridge
- Wheatstone bridge, also known as the resistance bridge, calculates the unknown resistance by balancing two legs of the bridge circuit. One leg includes the component of unknown resistance.
- 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 emf source and the galvanometer are always connected in the opposite branch.
Balance condition of Wheatstone bridge
The product of the opposite branch resistance must be equal.
\(R_1R_x=R_2R_3\)
\({R_x\over R_3}={R_2\over R_1}\)
Under balance conditions, the current through the galvanometer is zero, hence it shows zero deflection.
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