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

Two cells of emf's approximately 5 V and 10 V are to be accurately compared using a potentiometer of length 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 potential drop across the wire slightly exceeds 10V.

C

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

D

Potentiometer is usually used for comparing resistances and not voltages.

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