The potentiometer basically consists of a uniform wire of resistance R through which a…
Physics · JEE Advanced · NTA Exams — Current Electricity
The potentiometer basically consists of a uniform wire of resistance R through which a steady current flows when a driver cell source is connected between the points A and B (ends of potentiometer wire) and tapping is adjusted till no current passes through galvanometer. Using this null deflection method, unknown e.m.f. of a cell is determined. Using this concept answer the following questions.
The total length of the potentiometer wire is 10 m. The distance between the null points on potentiometer wire for two cells is 60 cm.If the difference between e.m.f.’s of the cells be 0.4 volt, the potential gradient along the wire is
- \(\frac{4}{3}\) volt/m
- 1 volt/m
- \(\frac{2}{3}\) volt/m
- \(\frac{1}{2}\) volt/m
Answer
(C) 2 3 volt/m
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