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Two cells of emfs approximately 5V and 10V are to be accurately compared using a potentiometer of length 400 cm.

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

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

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

Potentiometer is usually used for comparing resistances and not voltages

answer is B.

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Detailed Solution

The battery that runs the potentiometer should atleast be minimum 10 V and the resistance connected in series with the potentiometer can be adjusted to set the potential drop across the wire atleast lightly greater than 10V

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