Question

On which factor the accuracy of a potentiometer depends

Answer 1

The fall of potential across a potentiometer wire of length l is given by

V=IR

=IρlA

Potential gradient k=vl=IρA

=k∞I=> current passing through the potentio meter wire.

(ii) k∞ρ (ie) specific resistance of the material of the potentiometer wire.

(iii) k∞1A

(ie) area of cross section of the wire