A potentiometer wire of length 100 cm ha...

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` ?

`760 Omega`

`640 Omega`

`790 Omega`

`840 Omega`

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