defence exam Coast Guard Navik GD (General Duty) 02/2025 Mock Test Series Physics Current, Resistance and Electricity
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 voltage of 8 V.
2
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.
3
The first portion of 50 cm of wire itself should have a potential drop of 10 V.
4
Potentiometer is usually used for comparing resistances and not voltages.