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Q.

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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a

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

b

The diameter of the wires is the same and uniform throughout.

c

The number of wires is ten.

d

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

answer is A.

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Detailed Solution

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?