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 current in potentiometer wire is adjusted to give a null point at 56 cm with a standard cell of e.m.f. 1.02 volt. The e.m.f. of another cell for which null point is obtained at 70 cm is
- 0.78 volt
- 1.275 volt
- 1.35 volt
- 1.54 volt
Answer
(B) 1.275 volt
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