The **potential gradient** $K$ along a uniform potentiometer wire is defined as:
ACurrent per unit length
BResistance per unit length
CPotential difference per unit length of the wire
DEMF per unit area
Answer & Solution
Correct answer: C. Potential difference per unit length of the wire
$K = V_{AB}/L$ — potential drop per unit length along the wire. For a steady current and uniform wire, $K$ is constant and the potential at a point at distance $\ell$ from A is $V = K\ell$.
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