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A 10 m wire potentiometer has resistance 10Omega and is connected to an accumulator of 2 volt and negligible internal resistance. There are two resistance boxes R_(1) and R_(2) is series with the accumulator and one can have any integral values of resistance from resistance boxes. A standard Cd-cell of 1.018 V having a sensitive galvanometer in series with it is connected across R_(1). How would you proceed with the above arrangement to obtain a potential drop 1muV per mm of the potentiometer wire? Calculate value of R_(1) and R_(2) required. What length of this potentiometer will balance the thermo e.m.f. of iron-copper couple at 300^(@)C which develops 17muV//^(@)C? |
| Answer» SOLUTION :3.33 MILLIVOLT | |