A potentiometer wire of length L and a resistance r are connected in series with a battery of e.m.f. Eo and a resistance r1. An unknown e.m.f. is balanced at a length l of the potentiometer wire. The e.m.f. E will be given by

(a)LEor/lr1

(b)Eor/(r+r1)l/L

(c)Eol/L

(d)LEor/(r+r1)l

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