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Two cells of emfs approximately 5V and 1...

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

A

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

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 10 V

C

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

D

Potentiometer is usually used for comparing resistance and not voltages

Text Solution

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The correct Answer is:
B
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