Sometimes balance point may not be obtained on the potentiometer wire why
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If the emf of the auxiliary battery/ driver cell is less than the emf of the cell to be measured, then the balance point will not be obtained on the potentiometer wire. ... It indicates that aluminium wire is lighter than copper wire. Therefore, aluminium wires are preferred in overhead cables.
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It is possible only if the fall of potential across the potentiometer wire is less than the potential difference to be balanced by the potentiometer wire.
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