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For comparing the e.m.f.'s of two cells ...

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 gt

A

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

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

Text Solution

Verified by Experts

The correct Answer is:
D
(d) The emf of the standard cell must be greater than that of experimental cells, otherwise balance point is not obtained.
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