JEE PHYSICS MCQ: CURRENT ELECTRICITY

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For comparing the e.m.f.'s of two cells with a potentiometer, a standard cell is used to develop a potential gradient along the wires. Which of the following possibilities would make the experiment unsuccessful

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Correct option: D

The e.m.f. of the standard cell is smaller than the e.m.f.'s of the two cells

Option D (The e.m.f. of the standard cell is smaller than the e.m.f.'s of the two cells) is correct because the potentiometer requires the standard cell to have a higher EMF than the cells being compared to establish a potential gradient.

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