A potentiometer wire of length L and a resistance r are connected in series with a battery of e.m.f. E 0 and a resistance r 1 . An unknown e.m.f. E is balanced at a length l of the potentiometer wire. The e.m.f. E will be given by:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
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. E is balanced against length 
of the potentiometer wire,
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