Question

A potentiometer wire of length L and a resistance r are connected in series with a battery of e.m.f. E0 and a resistance r1. 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 :

Answer 1

Explanation:



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 l of the potentiometer wire,



Answer 2

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