**Q.No.13.9: - What is Wheatstone bridge? How it be used to determine an unknown resistance?**

**Ans: -**Wheatstone bridge is used to determine unknown resistance of a wire. The circuit is consists of four resistances R

_{1}, R

_{2}, R

_{3}, R

_{4}connected in such a way as to form a loop or mesh ABCDA. A battery of emf E is connected between points A and C. A galvanometer of resistance R

_{g}is connected between the points B and D.

When the bridge is balanced, it
satisfied the following relation

R

_{1}/R_{2}= R_{3}/R_{4}
Or, R

If the value of R_{4}= R_{2}.R_{3}/R_{1}_{1}, R

_{2}, and R

_{3}are known then R

_{4}can be calculated. The galvanometer should not show any deflection by adjusting the potential between terminals B and D. (Sorry for Diagram. Pleas concert with Text Book for diagram.)

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