Ncert Exercises & Solutions

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

1.	The battery that runs the potentiometer should have a voltage of \(8\) V
2.	The battery of the potentiometer can have a voltage of \(15\) V and \(R\) adjusted so that the potential drop across the wire slightly exceeds \(10\) V
3.	The first portion of \(50\) cm of the wire itself should have a potential drop of \(10\) V
4.	Potentiometer is usually used for comparing resistances and not voltages