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प्रश्न
Two cells of emfs approximately 5 V and 10 V are to be accurately compared using a potentiometer of length 400 cm.
पर्याय
The battery that runs the potentiometer should have voltage of 8V.
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.
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.
MCQ
उत्तर
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.
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