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Two cells of emf's approximately 5V and ...

Two cells of emf's approximately 5V and 10 V are to be accurately compared using a potentiometer of legth 400 cm.

A

The battery that runs the potentiometer should have voltage of 8V.

B

The battery of potentiometer can have a voltage of 15 V and R adjusted so that the potentional drop across the wire slightly exceeds 10V.

C

The first portion of 50 cm of wire itself should have a potentional drop of 10 V.

D

Potentionmeter is usually used for comparing resistance and not voltages.

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