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 emf of `10 mV` is balanced against a length of `40 cm` of the potentiometer wire. What is the value of resistance `R` ?A. `790 Omega`B. `890 Omega`C. `990 Omega`D. `1090 Omega`

A potentiometer wire of length `100 cm` having a resistance of `10 Ome

1.	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 emf of `10 mV` is balanced against a length of `40 cm` of the potentiometer wire. What is the value of resistance `R` ?A. `790 Omega`B. `890 Omega`C. `990 Omega`D. `1090 Omega`
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