If the resistivity of a potentiometer wire be $\rho $ and area of cross-section be $A$, then what will be potential gradient along the wire
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(a) Potential gradient $x = \frac{V}{L} = \frac{{iR}}{L} = \frac{{i\,\left( {\frac{{\rho L}}{A}} \right)}}{L} = \frac{{i\rho }}{A}$
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