Answer:
Definition of potential gradient of the potentiometer wire:
It is based on the fact that the potential drop in any segment of wire is directly proportional to the length of the segment of wire, provided that the cross-sectional area of the wire is uniform and that it carries a constant current.V ∝ l
The potential gradient is the potential drop per unit length of the potentiometer wire.
Potential gradient =K = V/ L= IR / L
(We know,V= IR)
K = (IρL/A)/L
So, K = Iρ/A
The drop in potential per unit length along the potentiometer wire is called the potential gradient. If L is the length of wire AB and V is its potential difference, then the potential gradient k = V/L S.I potential gradient. unit of measurement is volt/meter.
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