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 [RPET 1996]

• A.                    \[\frac{I\rho }{A}\]
• B.                                      \[\frac{I}{A\rho }\]
• C.                    \[\frac{IA}{\rho }\]    
• D.            \[IA\rho \]