An ideal battery of 4 V and resistance R are connected in series in the primary circuit of a potentiometer of length 
and resistance 
. The value of R, to give a potential difference of 
across 
of potentiometer wire is:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
JEE Main 2019
Current flowing through the circuit (I) is given by
Resistance of length 
of wire
According to question,
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