Two cells of emf’s approximately 5V and 10V are to be accurately compared using a potentiometer of length 400cm. A. The battery that runs the potentiometer should have a voltage of 8V. 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 portion of 50 cm of the wire itself should have a potential drop of 10V. D. Potentiometer is usually used for comparing resistances and not voltages.

The correct answer is the option (b)

Explanation: The potential drop along the wires of the potentiometer should be greater than the emfs of cells. The battery of potentiometer must be in excess of 10V.

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