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 to get a potential gradient 1 mV per cm on the wire is
44 $\Omega $
48 $\Omega $
32 $\Omega $
40 $\Omega $
Solution
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