1.

The variation of potential difference V with length l in the case of two potentiometer P and Q is asshown. Which of these two will you prefer for comparing the e.m.f.s of two primary cells?[CBSE AI 2006, 1997]1>

Answer»

The Potentiometer Y has a lesser potential gradient (V/l) than the Potentiometer X. The Potentiometer Y will need comparatively more length to measure the same potential difference. Therefore, it will be more accurate and sensitive. Hence, the Potentiometer Y will be prefered than the Potentiometer X.



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