Two cells of emf’s approximately 5 V and 10 V are to be acc…

Physics Current Electricity Kirchhoff's Law, EMF of The Cells, Internal Resistance MCQ (Single Correct)

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

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

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

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

Potentiometer is usually used for comparing resistances and not voltages.

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The correct answer is:

The balance pint can be obtained only if the potential difference across the wire is greater than the emf’s to be compared (or measured). Therefore, option is correct.

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