A potentiometer wire of length 
has a resistance of 
. It is connected in series with a resistance of 
and an accumulator of emf 
having negligible internal resistance. A source of 
is. balanced against a length 
of the potentiometer wire. The value of 
is
A
B
C
D
.
Text Solution
Verified by ExpertsThe correct answer is:
B
The current in the potentiometer wire 
is
The potential difference across the potentiometer wire is 
current 
resistance 
The length of the wire is 
. So, the potential gradient along the wire is
The emf 
is balanced against a length 
of the potentiometer wire.
i.e., 
or 
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