A potentiometre wire has length 4m resis...

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

40`Omega`

44`Omega`

48`Omega`

32`Omega`

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