The length of a potentiometer wire is 1200 cm and it carries a current of 60 mA
PHYSICS · Single correct · CBSE · Physics · Current Electricity · Current Electricity
Problem
The length of a potentiometer wire is 1200 cm and it carries a current of 60 mA. For a cell of emf 5 V and internal resistance of 20Ω , the null point on it is found to be at 1000 cm. The resistance of whole wire is :
(1) 80Ω
(2) 120Ω
(3) 60Ω
(4) 100Ω