A potentiometer wire of length `100 cm` having a resistance of `10 Omega` is connected  in
Channel: Doubtnut
Date: 2020-08-16

A potentiometer wire of length `100 cm` having a resistance of `10 Omega` is connected  in series with a resistance `R` and a cell of emf `2V` of negligible internal resistance. A source of emfof `10 mV` is balanced against a length of `40 cm` of the potentiometer wire. What is the value of resistance `R` ?