A potentiometer wire of length 100 cm ha...

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

`790Omega`

`1000Omega`

`1120Omega`

`1430Omega`

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