A potentiometer wire has length 4 m and ...

A potentiometer wire has length `4 m` and resistance `8 Omega`. The resistance that must be connected in series with the wire and an accumulator of e.m.f. `2 V`, so as the get a potential gradient `1 mV` per cm` on the wire is

`32Omega`

`40Omega`

`57Omega`

`35Omega`

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