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

Two cells of emf 's approximately 5 V and 10V are to be accurately compared using a potentimeter 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 15V and R adjusted so that the potential drop across the wire slightly exceeds 10V

C

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

D

Potentimeter is usually used for comparing resistance and not voltages

Text Solution

Verified by Experts

The correct Answer is:
B
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