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A potential gradient is created in the w...

A potential gradient is created in the wire by a standard cell for the comparision of emf's of two cells in a potentiometer experiment. Which possibility of the following will cause failure of the experiment.

A

the emf of the standard cell is higher than that of the other cells.

B

the diameter of the wires is equal and similar,

C

the number of wires is ten.

D

the emf of the standrad cell is less than those of both the cells.

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