A potentiometer wire of length 
and a resistance 
are connected in series with a battery of e.m.f. 
and a resistance 
. An unknown e.m.f. 
is balanced at a length 
of the potentiometer wire. The e.m.f. 
will be given by
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
The current through the potentiometer wire is
and the potential difference across the wire is
The potential gradient along the potentiometer wire is
As the unknown e.m.f. 
is balanced against length 
of the potentiometer wire,
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