Question

What are the factor does the potential gradient of the potentiometer wire depend ?

Answer 1

The fall of potential across a potentiometer wire of length l is given byV=IRV=IR=IρlA=IρlAPotential gradient k=vl=IρAk=vl=IρA=k∞I=>=k∞I=> current passing through the potentio meter wire.(ii) k∞ρk∞ρ (ie) specific resistance of the material of the potentiometer wire.(iii) k∞1Ak∞1A(ie) area of cross section of the wire