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A potentiometer wire of length 1m and re...

A potentiometer wire of length 1m and resistance `10 Omega` is connected in series with a cell of emf 2V with internal resistance `1 Omega` and a resistance box including a resistance R. If potential difference between the ends of the wire is 1 mV, the value of R is

A

`20000Omega`

B

`19989Omega`

C

`10000Omega`

D

`9989Omega`

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