A potentiometer wire of length 100 cm has a resistance of 10

Last updated: 6/12/2023

A potentiometer wire of length 100 cm has a resistance of 10 Q It is connected in series with a resistance R and a cell of emf 2 V and of negligible resistance A source of emf 10 mV is balanced against a length of 40 cm of the potentiometer wire What is the value of R 790 Q 850 Q 720 Q 620 Q