A potentiometer has uniform potential gradient. The specific resistance of the material of the potentiometer wire is $10^{-7} \, ohm-meter$ and the current passing through it is $0.1\, ampere$; cross-section of the wire is $10^{-6}\, m^2$. The potential gradient along the potentiometer wire is
AIPMT 2001, Medium
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Potential gradient $(x)$ $ = \frac{{i\rho }}{A}$ $ = \frac{{0.1 \times {{10}^{ - 7}}}}{{{{10}^{ - 6}}}} = {10^{ - 2}}\,V/m$
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