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

The emf of the standard cell is larger than the `E` emf's of the two cells

The diameter of the wires is the same and uniform throughout

The number of wires is ten

The emf of the standard cell is smaller than the emf's of the two cells.

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