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?
- AThe $e.m.f.$ of the standard cell is larger than the $e.m.f.$'s of the two cells.
- BThe diameter of the wires is the same and uniform throughout.
- CThe number of wires is ten.
- DThe $e.m.f.$ of the standard cell is smaller than the $e.m.f.$'s of the two cells.
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