Q3.4Multiple choice
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 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 wire itself should have a potential drop of 10V.
- (d)Potentiometer is usually used for comparing resistances and not voltages.