Questions
Resistance of a potentiometer wire of length 4 m is and emf of its driving cell is 4 volt. What resistance must be added in series with potentiometer wire so that 3 m length of potentiometer wire can balance a cell of emf 2 volt ?
detailed solution
Correct option is D
Resistance per unit length of potentiometer wire is λ=104 Ω/m=2.5 Ω/mAfter resistance R is inserted, in potentiometer wire circuit, current i=410+R A∴3 x 2.5 x 410+R=2⇒R=5 ΩTalk to our academic expert!
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An Edison cell and a Iead accumulator when placed in series produce a null deflection at a distance 204 cm in a potentiometer. But when placed in opposition produces null deflection. at a distance of 36 cm. If the e.m.f. of Edison cell is 1 . 4 V, the e.m.f. of lead accumulator is
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