A potentiometer wire has length 4 
and resistance 8 
. The resistance that must be connected in series with the wire and an accumulator of e.m.f. 
, so as to get a potential gradient 1 
per cm on the wire is
A
44 
B
48 
C
32 
D
40 
Text Solution
Verified by ExpertsThe correct answer is:
C
Required potential gradient
Length of potentiometer wire, 
So potential difference across potentiometer wire
(i)
In the circuit, potential difference across 8 
(ii)
Using equation (i) and (ii), we get, 
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