A 10 wire potentiometer has a resistance of 10 Omega and is connected to fan accumulator of 2 V and negligible internal resistance.There are two resistance boxes R_(1) and R_(2) in series with the accumulator and one can have any intergral values of resistance from resistance boxes . A standard-cellof 1.018 V with a sensitive galvanometer in series with it is connected across R_(1).How would you proceed with the above arrangement to obtain potential drop of 1 mu V per mm of the potentiometer wire? Calculate the vlue3s of R_(1) and R_(2) requried. What length of this potentiometer will balance the thermo emf of and copper couple at 300^(@)C which develops 17muV//^(0)C?

A 10 wire potentiometer has a resistance of 10 Omega and is connected

1.	A 10 wire potentiometer has a resistance of 10 Omega and is connected to fan accumulator of 2 V and negligible internal resistance.There are two resistance boxes R_(1) and R_(2) in series with the accumulator and one can have any intergral values of resistance from resistance boxes . A standard-cellof 1.018 V with a sensitive galvanometer in series with it is connected across R_(1).How would you proceed with the above arrangement to obtain potential drop of 1 mu V per mm of the potentiometer wire? Calculate the vlue3s of R_(1) and R_(2) requried. What length of this potentiometer will balance the thermo emf of and copper couple at 300^(@)C which develops 17muV//^(0)C?
Answer» Answer :Put `R_(1)` =1018 `OMEGA`(1000 TIMES emf of Cd-cell),adust `R_(2)` till no deflection ocurs in the galvanometer , `R_(2)`=972 `Omega`;5.1 m

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