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.

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

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The diameter of the wires is the same and uniform throughout

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The number of wires is ten

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

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Solution

The correct option is D The e.m.f. of the standard cell is smaller than the e.m.f.'s of the two cells
The emf of the standard cell must be greater than that of experimental cells, otherwise balance point is not obtained.

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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.

The correct option is D The e.m.f. of the standard cell is smaller than the e.m.f.'s of the two cellsThe emf of the standard cell must be greater than that of experimental cells, otherwise balance point is not obtained.

The correct option is D The e.m.f. of the standard cell is smaller than the e.m.f.'s of the two cells
The emf of the standard cell must be greater than that of experimental cells, otherwise balance point is not obtained.