A potendiometer wire has length `4 m` and resistance `8 Omega`. The resistance
Channel: Doubtnut
Date: 2020-01-19

A potendiometer 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