Circuit diagram of metre bridge is shown in figure. The null point is found at a distance of 40cm from A. it now a resistance of `12Omega` is connected in parallel with S, the null point occurs at 64cm.

Circuit diagram of metre bridge is shown in figure. The null point is

1.	Circuit diagram of metre bridge is shown in figure. The null point is found at a distance of 40cm from A. it now a resistance of `12Omega` is connected in parallel with S, the null point occurs at 64cm.
Answer» Fro m the first balance point `(R)/(S)=(40)/(100-40)=(40)/(60)` If `12Omega` is connected in parallel with S then `S_(eq)=(12S)/(12+S)` so from new balance conditions `(R)/(S_(eq))=(64)/(36)` `rArr (R(S+12))/(12S)=(64)/(36)rArr((40)/(36))((S+12)/(12))=(64)/(36)rArrS+12=32rArrS=20Omega` So `R=((2)/(3))(20)=(40)/(3)Omega`

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Circuit diagram of metre bridge is shown in figure. The null point is found at a distance of 40cm from A. it now a resistance of `12Omega` is connected in parallel with S, the null point occurs at 64cm.

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