A potentiometer wire has length 4m and resistance 8 Ω Ω . 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 1mV per cm on the wire is:
Text Solution
Verified by ExpertsThe correct answer is:
D
Required potential gradient 
Length of potentiometer wire, 
So potential difference across potentiometer wire 
...(i)
In the circuit, potential difference across 
...(ii)
Using equation (i) and (ii), we get
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