In a wheat stone bridge experiment to determine the unknown resistance R_(4), the values of R_(1) and R_(2) were taken to be 10 Omega and 1 Omega respectively. It was found that the galvanometer will show exact zero deflection when value of R_(3) is taken as 643 Omega lt R_(3) lt 644 Omega. Now R_(1) is changed to 100 Omega (R_(2) remains unchanged). (a) If you have been asked to obtain a balanced bridge, which values of R_(3) will you try with? (b) If balance is obtained for 6432 Omega lt R_(3) klt 6433 Omega write the measured value of unknown resistance R_(4).

In a wheat stone bridge experiment to determine the unknown resistance

1.	In a wheat stone bridge experiment to determine the unknown resistance R_(4), the values of R_(1) and R_(2) were taken to be 10 Omega and 1 Omega respectively. It was found that the galvanometer will show exact zero deflection when value of R_(3) is taken as 643 Omega lt R_(3) lt 644 Omega. Now R_(1) is changed to 100 Omega (R_(2) remains unchanged). (a) If you have been asked to obtain a balanced bridge, which values of R_(3) will you try with? (b) If balance is obtained for 6432 Omega lt R_(3) klt 6433 Omega write the measured value of unknown resistance R_(4).
Answer» ANSWER :(a) We should try with `6430 Omega lt R_(3) lt 6440 Omega` (B) `R_(4) = 64.325 Omega`

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